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</div> <div class="control"> <button class="button is-small is-link">Go</button> </div> </div> </form> </div> </div> <nav class="pagination is-small is-centered breathe-horizontal" role="navigation" aria-label="pagination"> <a href="" class="pagination-previous is-invisible">Previous </a> <a href="/search/?searchtype=author&query=Hadjiyiannakou%2C+K&start=50" class="pagination-next" >Next </a> <ul class="pagination-list"> <li> <a href="/search/?searchtype=author&query=Hadjiyiannakou%2C+K&start=0" class="pagination-link is-current" aria-label="Goto page 1">1 </a> </li> <li> <a href="/search/?searchtype=author&query=Hadjiyiannakou%2C+K&start=50" class="pagination-link " aria-label="Page 2" aria-current="page">2 </a> </li> </ul> </nav> <ol class="breathe-horizontal" start="1"> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2310.01389">arXiv:2310.01389</a> <span> [<a href="https://arxiv.org/pdf/2310.01389">pdf</a>, <a href="https://arxiv.org/format/2310.01389">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="High Energy Physics - Lattice">hep-lat</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Phenomenology">hep-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Nuclear Theory">nucl-th</span> </div> </div> <p class="title is-5 mathjax"> Gluon PDF of the proton using twisted mass fermions </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-lat?searchtype=author&query=Delmar%2C+J">Joseph Delmar</a>, <a href="/search/hep-lat?searchtype=author&query=Alexandrou%2C+C">Constantia Alexandrou</a>, <a href="/search/hep-lat?searchtype=author&query=Cichy%2C+K">Krzysztof Cichy</a>, <a href="/search/hep-lat?searchtype=author&query=Constantinou%2C+M">Martha Constantinou</a>, <a href="/search/hep-lat?searchtype=author&query=Hadjiyiannakou%2C+K">Kyriakos Hadjiyiannakou</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2310.01389v1-abstract-short" style="display: inline;"> In this paper, we present lattice QCD results for the $x$-dependence of the unpolarized gluon PDF for the proton. We use one ensemble of $N_f=2+1+1$ maximally twisted mass fermions with a clover improvement, and the Iwasaki improved gluon action. The quark masses are tuned to produce a pion with a mass of 260 MeV. The ensemble has a lattice spacing of $a=0.093$ fm and a spatial extent of 3 fm. We… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2310.01389v1-abstract-full').style.display = 'inline'; document.getElementById('2310.01389v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2310.01389v1-abstract-full" style="display: none;"> In this paper, we present lattice QCD results for the $x$-dependence of the unpolarized gluon PDF for the proton. We use one ensemble of $N_f=2+1+1$ maximally twisted mass fermions with a clover improvement, and the Iwasaki improved gluon action. The quark masses are tuned to produce a pion with a mass of 260 MeV. The ensemble has a lattice spacing of $a=0.093$ fm and a spatial extent of 3 fm. We employ the pseudo-distribution approach, which relies on matrix elements of non-local operators that couple to momentum-boosted hadrons. In this work, we use five values of the momentum boost between 0 and 1.67 GeV. The gluon field strength tensors of the non-local operator are connected with straight Wilson lines of varying length $z$. The light-cone Ioffe time distribution (ITD) is extracted utilizing data with $z$ up to 0.56 fm and a quadratic parametrization in terms of the Ioffe time at fixed values of $z$. We explore systematic effects, such as the effect of the stout smearing for the gluon operator, excited states effects, and the dependence on the maximum value of $z$ entering the fits to obtain the gluon PDF. Also, for the first time, the mixing with the quark singlet PDFs is eliminated using matrix elements with non-local quark operators that were previously analyzed within the quasi-PDF framework on the same ensemble. Here, we expand the data set for the quark singlet and reanalyze within the pseudo-PDFs method eliminating the corresponding mixing in the gluon PDF. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2310.01389v1-abstract-full').style.display = 'none'; document.getElementById('2310.01389v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 2 October, 2023; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> October 2023. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2308.12458">arXiv:2308.12458</a> <span> [<a href="https://arxiv.org/pdf/2308.12458">pdf</a>, <a href="https://arxiv.org/format/2308.12458">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="High Energy Physics - Lattice">hep-lat</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Phenomenology">hep-ph</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevD.108.094514">10.1103/PhysRevD.108.094514 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Pion Transition Form Factor from Twisted-Mass Lattice QCD and the Hadronic Light-by-Light $蟺^0$-pole Contribution to the Muon $g-2$ </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-lat?searchtype=author&query=Alexandrou%2C+C">C. Alexandrou</a>, <a href="/search/hep-lat?searchtype=author&query=Bacchio%2C+S">S. Bacchio</a>, <a href="/search/hep-lat?searchtype=author&query=Bergner%2C+G">G. Bergner</a>, <a href="/search/hep-lat?searchtype=author&query=Burri%2C+S">S. Burri</a>, <a href="/search/hep-lat?searchtype=author&query=Finkenrath%2C+J">J. Finkenrath</a>, <a href="/search/hep-lat?searchtype=author&query=Gasbarro%2C+A">A. Gasbarro</a>, <a href="/search/hep-lat?searchtype=author&query=Hadjiyiannakou%2C+K">K. Hadjiyiannakou</a>, <a href="/search/hep-lat?searchtype=author&query=Jansen%2C+K">K. Jansen</a>, <a href="/search/hep-lat?searchtype=author&query=Kanwar%2C+G">G. Kanwar</a>, <a href="/search/hep-lat?searchtype=author&query=Kostrzewa%2C+B">B. Kostrzewa</a>, <a href="/search/hep-lat?searchtype=author&query=Koutsou%2C+G">G. Koutsou</a>, <a href="/search/hep-lat?searchtype=author&query=Ottnad%2C+K">K. Ottnad</a>, <a href="/search/hep-lat?searchtype=author&query=Petschlies%2C+M">M. Petschlies</a>, <a href="/search/hep-lat?searchtype=author&query=Pittler%2C+F">F. Pittler</a>, <a href="/search/hep-lat?searchtype=author&query=Steffens%2C+F">F. Steffens</a>, <a href="/search/hep-lat?searchtype=author&query=Urbach%2C+C">C. Urbach</a>, <a href="/search/hep-lat?searchtype=author&query=Wenger%2C+U">U. Wenger</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2308.12458v2-abstract-short" style="display: inline;"> The neutral pion generates the leading pole contribution to the hadronic light-by-light tensor, which is given in terms of the nonperturbative transition form factor $\mathcal{F}_{蟺^0纬纬}(q_1^2,q_2^2)$. Here we present an ab-initio lattice calculation of this quantity in the continuum and at the physical point using twisted-mass lattice QCD. We report our results for the transition form factor para… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2308.12458v2-abstract-full').style.display = 'inline'; document.getElementById('2308.12458v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2308.12458v2-abstract-full" style="display: none;"> The neutral pion generates the leading pole contribution to the hadronic light-by-light tensor, which is given in terms of the nonperturbative transition form factor $\mathcal{F}_{蟺^0纬纬}(q_1^2,q_2^2)$. Here we present an ab-initio lattice calculation of this quantity in the continuum and at the physical point using twisted-mass lattice QCD. We report our results for the transition form factor parameterized using a model-independent conformal expansion valid for arbitrary space-like kinematics and compare it with experimental measurements of the single-virtual form factor, the two-photon decay width, and the slope parameter. We then use the transition form factors to compute the pion-pole contribution to the hadronic light-by-light scattering in the muon $g-2$, finding $a_渭^{蟺^0\text{-pole}} = 56.7(3.2) \times 10^{-11}$. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2308.12458v2-abstract-full').style.display = 'none'; document.getElementById('2308.12458v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 3 January, 2024; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 23 August, 2023; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> August 2023. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">21 pages, 17 figures, 4 tables, updated to published version</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys.Rev.D 108 (2023) 9, 094514 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2212.12493">arXiv:2212.12493</a> <span> [<a href="https://arxiv.org/pdf/2212.12493">pdf</a>, <a href="https://arxiv.org/format/2212.12493">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="High Energy Physics - Lattice">hep-lat</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Phenomenology">hep-ph</span> </div> </div> <p class="title is-5 mathjax"> Lattice calculation of the R-ratio smeared with Gaussian kernel </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-lat?searchtype=author&query=Alexandrou%2C+C">Constantia Alexandrou</a>, <a href="/search/hep-lat?searchtype=author&query=Bacchio%2C+S">Simone Bacchio</a>, <a href="/search/hep-lat?searchtype=author&query=De+Santis%2C+A">Alessandro De Santis</a>, <a href="/search/hep-lat?searchtype=author&query=Dimopoulos%2C+P">Petros Dimopoulos</a>, <a href="/search/hep-lat?searchtype=author&query=Finkenrath%2C+J">Jacob Finkenrath</a>, <a href="/search/hep-lat?searchtype=author&query=Frezzotti%2C+R">Roberto Frezzotti</a>, <a href="/search/hep-lat?searchtype=author&query=Gagliardi%2C+G">Giuseppe Gagliardi</a>, <a href="/search/hep-lat?searchtype=author&query=Garofalo%2C+M">Marco Garofalo</a>, <a href="/search/hep-lat?searchtype=author&query=Hadjiyiannakou%2C+K">Kyriakos Hadjiyiannakou</a>, <a href="/search/hep-lat?searchtype=author&query=Kostrzewa%2C+B">Bartosz Kostrzewa</a>, <a href="/search/hep-lat?searchtype=author&query=Jansen%2C+K">Karl Jansen</a>, <a href="/search/hep-lat?searchtype=author&query=Lubicz%2C+V">Vittorio Lubicz</a>, <a href="/search/hep-lat?searchtype=author&query=Petschlies%2C+M">Marcus Petschlies</a>, <a href="/search/hep-lat?searchtype=author&query=Sanfilippo%2C+F">Francesco Sanfilippo</a>, <a href="/search/hep-lat?searchtype=author&query=Simula%2C+S">Silvano Simula</a>, <a href="/search/hep-lat?searchtype=author&query=Tantalo%2C+N">Nazario Tantalo</a>, <a href="/search/hep-lat?searchtype=author&query=Urbach%2C+C">Carsten Urbach</a>, <a href="/search/hep-lat?searchtype=author&query=Wenger%2C+U">Urs Wenger</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2212.12493v1-abstract-short" style="display: inline;"> The ratio $R(E)$ of the cross-sections for $e^+e^-\to$ hadrons and $e^+e^-\to 渭^+渭^-$ is a valuable energy-dependent probe of the hadronic sector of the Standard Model. Moreover, the experimental measurements of $R(E)$ are the inputs of the dispersive calculations of the leading hadronic vacuum polarization contribution to the muon $g-2$ and these are in significant tension with direct lattice cal… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2212.12493v1-abstract-full').style.display = 'inline'; document.getElementById('2212.12493v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2212.12493v1-abstract-full" style="display: none;"> The ratio $R(E)$ of the cross-sections for $e^+e^-\to$ hadrons and $e^+e^-\to 渭^+渭^-$ is a valuable energy-dependent probe of the hadronic sector of the Standard Model. Moreover, the experimental measurements of $R(E)$ are the inputs of the dispersive calculations of the leading hadronic vacuum polarization contribution to the muon $g-2$ and these are in significant tension with direct lattice calculations and with the muon $g-2$ experiment. In this talk we discuss the results of our first-principles lattice study of $R(E)$. By using a recently proposed method for extracting smeared spectral densities from Euclidean lattice correlators, we have calculated $R(E)$ convoluted with Gaussian kernels of different widths $蟽$ and central energies up to $2.5$ GeV. Our theoretical results have been compared with the KNT19 [1] compilation of experimental results smeared with the same Gaussian kernels and a tension (about three standard deviations) has been observed for $蟽\sim 600$ MeV and central energies around the $蟻$-resonance peak. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2212.12493v1-abstract-full').style.display = 'none'; document.getElementById('2212.12493v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 23 December, 2022; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> December 2022. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">Contribution to the 39th International Symposium on Lattice Field Theory (Lattice2022), 8th-13th August, 2022, Bonn, Germany</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2212.11399">arXiv:2212.11399</a> <span> [<a href="https://arxiv.org/pdf/2212.11399">pdf</a>, <a href="https://arxiv.org/format/2212.11399">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="High Energy Physics - Lattice">hep-lat</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Theory">hep-th</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Nuclear Theory">nucl-th</span> </div> </div> <p class="title is-5 mathjax"> Gluon PDF for the proton using the twisted mass formulation of lattice QCD </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-lat?searchtype=author&query=Delmar%2C+J">Joseph Delmar</a>, <a href="/search/hep-lat?searchtype=author&query=Alexandrou%2C+C">Constantia Alexandrou</a>, <a href="/search/hep-lat?searchtype=author&query=Cichy%2C+K">Krzysztof Cichy</a>, <a href="/search/hep-lat?searchtype=author&query=Constantinou%2C+M">Martha Constantinou</a>, <a href="/search/hep-lat?searchtype=author&query=Hadjiyiannakou%2C+K">Kyriakos Hadjiyiannakou</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2212.11399v1-abstract-short" style="display: inline;"> We present results of the x-dependence of the unpolarized gluon PDF for the proton. We use an $N_f=2+1+1$ ensemble of maximally twisted mass fermions with clover improvement and the Iwasaki improved gluon action. The quark masses are tuned so that the pion mass is 260 MeV. We use a $32^3\times64$ lattice size with a lattice spacing $a=0.093$ fm giving a spatial extent of 3 fm. We employ the pseudo… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2212.11399v1-abstract-full').style.display = 'inline'; document.getElementById('2212.11399v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2212.11399v1-abstract-full" style="display: none;"> We present results of the x-dependence of the unpolarized gluon PDF for the proton. We use an $N_f=2+1+1$ ensemble of maximally twisted mass fermions with clover improvement and the Iwasaki improved gluon action. The quark masses are tuned so that the pion mass is 260 MeV. We use a $32^3\times64$ lattice size with a lattice spacing $a=0.093$ fm giving a spatial extent of 3 fm. We employ the pseudo-distribution approach and obtain the light-cone Ioffe time distribution (ITD) combining data for nucleon momentum boosts up to 1.67 GeV and Wilson line lengths, $z$, up to 0.56 fm. We explore systematic effects such as the dependence on the maximum value of $z$ entering the fits to obtain the gluon PDF. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2212.11399v1-abstract-full').style.display = 'none'; document.getElementById('2212.11399v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 21 December, 2022; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> December 2022. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2212.10490">arXiv:2212.10490</a> <span> [<a href="https://arxiv.org/pdf/2212.10490">pdf</a>, <a href="https://arxiv.org/format/2212.10490">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="High Energy Physics - Phenomenology">hep-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Lattice">hep-lat</span> </div> </div> <p class="title is-5 mathjax"> Short \& intermediate distance HVP contributions to muon g-2: SM (lattice) prediction versus $e^+e^-$ annihilation data </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-lat?searchtype=author&query=Alexandrou%2C+C">Constantia Alexandrou</a>, <a href="/search/hep-lat?searchtype=author&query=Bacchio%2C+S">Simone Bacchio</a>, <a href="/search/hep-lat?searchtype=author&query=Dimopoulos%2C+P">Petros Dimopoulos</a>, <a href="/search/hep-lat?searchtype=author&query=Finkenrath%2C+J">Jacob Finkenrath</a>, <a href="/search/hep-lat?searchtype=author&query=Frezzotti%2C+R">Roberto Frezzotti</a>, <a href="/search/hep-lat?searchtype=author&query=Gagliardi%2C+G">Giuseppe Gagliardi</a>, <a href="/search/hep-lat?searchtype=author&query=Garofalo%2C+M">Marco Garofalo</a>, <a href="/search/hep-lat?searchtype=author&query=Hadjiyiannakou%2C+K">Kyriakos Hadjiyiannakou</a>, <a href="/search/hep-lat?searchtype=author&query=Kostrzewa%2C+B">Bartosz Kostrzewa</a>, <a href="/search/hep-lat?searchtype=author&query=Jansen%2C+K">Karl Jansen</a>, <a href="/search/hep-lat?searchtype=author&query=Lubicz%2C+V">Vittorio Lubicz</a>, <a href="/search/hep-lat?searchtype=author&query=Petschlies%2C+M">Marcus Petschlies</a>, <a href="/search/hep-lat?searchtype=author&query=Sanfilippo%2C+F">Francesco Sanfilippo</a>, <a href="/search/hep-lat?searchtype=author&query=Simula%2C+S">Silvano Simula</a>, <a href="/search/hep-lat?searchtype=author&query=Urbach%2C+C">Carsten Urbach</a>, <a href="/search/hep-lat?searchtype=author&query=Wenger%2C+U">Urs Wenger</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2212.10490v1-abstract-short" style="display: inline;"> We present new lattice results of the ETM Collaboration, obtained from extensive simulations of lattice QCD with dynamical up, down, strange and charm quarks at physical mass values, different volumes and lattice spacings, concerning the SM prediction for the so-called intermediate window (W) and short-distance (SD) contributions to the leading order hadronic vacuum polarization (LO-HVP) term of t… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2212.10490v1-abstract-full').style.display = 'inline'; document.getElementById('2212.10490v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2212.10490v1-abstract-full" style="display: none;"> We present new lattice results of the ETM Collaboration, obtained from extensive simulations of lattice QCD with dynamical up, down, strange and charm quarks at physical mass values, different volumes and lattice spacings, concerning the SM prediction for the so-called intermediate window (W) and short-distance (SD) contributions to the leading order hadronic vacuum polarization (LO-HVP) term of the muon anomalous magnetic moment, $a_渭$. Results for $a_渭^{\rm LO-HVP,W}$ and $a_渭^{\rm LO-HVP,SD}$, besides representing a step forward to a complete lattice computation of $a_渭^{\rm LO-HVP}$ and a useful benchmark among lattice groups, are compared here with their dispersive counterparts based on experimental data for $e^+e^-$ into hadrons. The comparison confirms the tension in $a_渭^{\rm LO-HVP,W}$, already noted in 2020 by the BMW Collaboration, while showing no tension in $a_渭^{\rm LO-HVP,SD}$. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2212.10490v1-abstract-full').style.display = 'none'; document.getElementById('2212.10490v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 20 December, 2022; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> December 2022. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">Talk given at ICHEP 2022 (6-13 July 2022, Bologna - Italy) - Results here are almost final - Contribution accepted for publication on PoS</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2212.10300">arXiv:2212.10300</a> <span> [<a href="https://arxiv.org/pdf/2212.10300">pdf</a>, <a href="https://arxiv.org/format/2212.10300">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="High Energy Physics - Lattice">hep-lat</span> </div> </div> <p class="title is-5 mathjax"> Pseudoscalar-pole contributions to the muon $g-2$ at the physical point </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-lat?searchtype=author&query=Burri%2C+S">Sebastian Burri</a>, <a href="/search/hep-lat?searchtype=author&query=Kanwar%2C+G">Gurtej Kanwar</a>, <a href="/search/hep-lat?searchtype=author&query=Alexandrou%2C+C">Constantia Alexandrou</a>, <a href="/search/hep-lat?searchtype=author&query=Bacchio%2C+S">Simone Bacchio</a>, <a href="/search/hep-lat?searchtype=author&query=Bergner%2C+G">Georg Bergner</a>, <a href="/search/hep-lat?searchtype=author&query=Finkenrath%2C+J">Jacob Finkenrath</a>, <a href="/search/hep-lat?searchtype=author&query=Gasbarro%2C+A">Andrew Gasbarro</a>, <a href="/search/hep-lat?searchtype=author&query=Hadjiyiannakou%2C+K">Kyriakos Hadjiyiannakou</a>, <a href="/search/hep-lat?searchtype=author&query=Jansen%2C+K">Karl Jansen</a>, <a href="/search/hep-lat?searchtype=author&query=Kostrzewa%2C+B">Bartosz Kostrzewa</a>, <a href="/search/hep-lat?searchtype=author&query=Koutsou%2C+G">Giannis Koutsou</a>, <a href="/search/hep-lat?searchtype=author&query=Ottnad%2C+K">Konstantin Ottnad</a>, <a href="/search/hep-lat?searchtype=author&query=Petschlies%2C+M">Marcus Petschlies</a>, <a href="/search/hep-lat?searchtype=author&query=Pittler%2C+F">Ferenc Pittler</a>, <a href="/search/hep-lat?searchtype=author&query=Steffens%2C+F">Fernanda Steffens</a>, <a href="/search/hep-lat?searchtype=author&query=Urbach%2C+C">Carsten Urbach</a>, <a href="/search/hep-lat?searchtype=author&query=Wenger%2C+U">Urs Wenger</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2212.10300v1-abstract-short" style="display: inline;"> Pseudoscalar-pole diagrams are an important component of estimates of the hadronic light-by-light (HLbL) contribution to the muon $g-2$. We report on our computation of the transition form factors $\mathcal{F}_{P \rightarrow 纬^* 纬^*}$ for the neutral pseudoscalar mesons $P=蟺^0$ and $畏$. The calculation is performed using twisted-mass lattice QCD with physical quark masses. On the lattice, we have… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2212.10300v1-abstract-full').style.display = 'inline'; document.getElementById('2212.10300v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2212.10300v1-abstract-full" style="display: none;"> Pseudoscalar-pole diagrams are an important component of estimates of the hadronic light-by-light (HLbL) contribution to the muon $g-2$. We report on our computation of the transition form factors $\mathcal{F}_{P \rightarrow 纬^* 纬^*}$ for the neutral pseudoscalar mesons $P=蟺^0$ and $畏$. The calculation is performed using twisted-mass lattice QCD with physical quark masses. On the lattice, we have access to a broad range of (space-like) photon four-momenta and therefore produce form factor data complementary to the experimentally accessible single-virtual direction, which directly leads to an estimate of the pion- and $畏$-pole components of the muon $g-2$. For the pion, our result for the $g-2$ contribution in the continuum is comparable with previous lattice and data-driven determinations, with combined relative uncertainties below $10\%$. For the $畏$ meson, we report on a preliminary determination from a single lattice spacing. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2212.10300v1-abstract-full').style.display = 'none'; document.getElementById('2212.10300v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 20 December, 2022; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> December 2022. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2212.09340">arXiv:2212.09340</a> <span> [<a href="https://arxiv.org/pdf/2212.09340">pdf</a>, <a href="https://arxiv.org/format/2212.09340">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="High Energy Physics - Lattice">hep-lat</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Phenomenology">hep-ph</span> </div> </div> <p class="title is-5 mathjax"> Time windows of the muon HVP from twisted-mass lattice QCD </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-lat?searchtype=author&query=Alexandrou%2C+C">C. Alexandrou</a>, <a href="/search/hep-lat?searchtype=author&query=Bacchio%2C+S">S. Bacchio</a>, <a href="/search/hep-lat?searchtype=author&query=Dimopoulos%2C+P">P. Dimopoulos</a>, <a href="/search/hep-lat?searchtype=author&query=Finkenrath%2C+J">J. Finkenrath</a>, <a href="/search/hep-lat?searchtype=author&query=Frezzotti%2C+R">R. Frezzotti</a>, <a href="/search/hep-lat?searchtype=author&query=Gagliardi%2C+G">G. Gagliardi</a>, <a href="/search/hep-lat?searchtype=author&query=Garofalo%2C+M">M. Garofalo</a>, <a href="/search/hep-lat?searchtype=author&query=Hadjiyiannakou%2C+K">K. Hadjiyiannakou</a>, <a href="/search/hep-lat?searchtype=author&query=Kostrzewa%2C+B">B. Kostrzewa</a>, <a href="/search/hep-lat?searchtype=author&query=Jansen%2C+K">K. Jansen</a>, <a href="/search/hep-lat?searchtype=author&query=Lubicz%2C+V">V. Lubicz</a>, <a href="/search/hep-lat?searchtype=author&query=Petschlies%2C+M">M. Petschlies</a>, <a href="/search/hep-lat?searchtype=author&query=Sanfilippo%2C+F">F. Sanfilippo</a>, <a href="/search/hep-lat?searchtype=author&query=Simula%2C+S">S. Simula</a>, <a href="/search/hep-lat?searchtype=author&query=Urbach%2C+C">C. Urbach</a>, <a href="/search/hep-lat?searchtype=author&query=Wenger%2C+U">U. Wenger</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2212.09340v1-abstract-short" style="display: inline;"> We present a lattice determination of the leading-order hadronic vacuum polarization (HVP) contribution to the muon anomalous magnetic moment, $a_渭^{\rm HVP}$, in the so-called short and intermediate time-distance windows, $a_渭^{\rm SD}$ and $a_渭^{\rm W}$. We employ gauge ensembles produced by the Extended Twisted Mass Collaboration (ETMC) with $N_f = 2 + 1 + 1$ flavours of Wilson-clover twisted-m… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2212.09340v1-abstract-full').style.display = 'inline'; document.getElementById('2212.09340v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2212.09340v1-abstract-full" style="display: none;"> We present a lattice determination of the leading-order hadronic vacuum polarization (HVP) contribution to the muon anomalous magnetic moment, $a_渭^{\rm HVP}$, in the so-called short and intermediate time-distance windows, $a_渭^{\rm SD}$ and $a_渭^{\rm W}$. We employ gauge ensembles produced by the Extended Twisted Mass Collaboration (ETMC) with $N_f = 2 + 1 + 1$ flavours of Wilson-clover twisted-mass quarks with masses of all the dynamical quark flavours tuned close to their physical values. The simulations are carried out at three values of the lattice spacing equal to $\simeq 0.057, 0.068$ and $0.080$ fm with spatial lattice sizes up to $L \simeq 7.6$~fm. For the short distance window we obtain $a_渭^{\rm SD} = 69.27\,(34) \cdot 10^{-10}$, in agreement with the dispersive determination based on experimental $e^+ e^-$ data. For the intermediate window we get instead $a_渭^{\rm W} = 236.3\,(1.3) \cdot 10^{-10}$, which is consistent with recent determinations by other lattice collaborations, but disagrees with the dispersive determination at the level of $3.6\,蟽$. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2212.09340v1-abstract-full').style.display = 'none'; document.getElementById('2212.09340v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 19 December, 2022; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> December 2022. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">10 pages, 4 figures, 1 table, LATTICE 2022</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2212.08467">arXiv:2212.08467</a> <span> [<a href="https://arxiv.org/pdf/2212.08467">pdf</a>, <a href="https://arxiv.org/format/2212.08467">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="High Energy Physics - Lattice">hep-lat</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Phenomenology">hep-ph</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevLett.130.241901">10.1103/PhysRevLett.130.241901 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Probing the energy-smeared R-ratio on the lattice </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-lat?searchtype=author&query=Alexandrou%2C+C">Constantia Alexandrou</a>, <a href="/search/hep-lat?searchtype=author&query=Bacchio%2C+S">Simone Bacchio</a>, <a href="/search/hep-lat?searchtype=author&query=De+Santis%2C+A">Alessandro De Santis</a>, <a href="/search/hep-lat?searchtype=author&query=Dimopoulos%2C+P">Petros Dimopoulos</a>, <a href="/search/hep-lat?searchtype=author&query=Finkenrath%2C+J">Jacob Finkenrath</a>, <a href="/search/hep-lat?searchtype=author&query=Frezzotti%2C+R">Roberto Frezzotti</a>, <a href="/search/hep-lat?searchtype=author&query=Gagliardi%2C+G">Giuseppe Gagliardi</a>, <a href="/search/hep-lat?searchtype=author&query=Garofalo%2C+M">Marco Garofalo</a>, <a href="/search/hep-lat?searchtype=author&query=Hadjiyiannakou%2C+K">Kyriakos Hadjiyiannakou</a>, <a href="/search/hep-lat?searchtype=author&query=Kostrzewa%2C+B">Bartosz Kostrzewa</a>, <a href="/search/hep-lat?searchtype=author&query=Jansen%2C+K">Karl Jansen</a>, <a href="/search/hep-lat?searchtype=author&query=Lubicz%2C+V">Vittorio Lubicz</a>, <a href="/search/hep-lat?searchtype=author&query=Petschlies%2C+M">Marcus Petschlies</a>, <a href="/search/hep-lat?searchtype=author&query=Sanfilippo%2C+F">Francesco Sanfilippo</a>, <a href="/search/hep-lat?searchtype=author&query=Simula%2C+S">Silvano Simula</a>, <a href="/search/hep-lat?searchtype=author&query=Tantalo%2C+N">Nazario Tantalo</a>, <a href="/search/hep-lat?searchtype=author&query=Urbach%2C+C">Carsten Urbach</a>, <a href="/search/hep-lat?searchtype=author&query=Wenger%2C+U">Urs Wenger</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2212.08467v2-abstract-short" style="display: inline;"> We present a first-principles lattice QCD investigation of the $R$-ratio between the $e^+e^-$ cross-section into hadrons and that into muons. By using the method of Ref.[1], that allows to extract smeared spectral densities from Euclidean correlators, we compute the $R$-ratio convoluted with Gaussian smearing kernels of widths of about $600$ MeV and central energies from $220$ MeV up to $2.5$ GeV.… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2212.08467v2-abstract-full').style.display = 'inline'; document.getElementById('2212.08467v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2212.08467v2-abstract-full" style="display: none;"> We present a first-principles lattice QCD investigation of the $R$-ratio between the $e^+e^-$ cross-section into hadrons and that into muons. By using the method of Ref.[1], that allows to extract smeared spectral densities from Euclidean correlators, we compute the $R$-ratio convoluted with Gaussian smearing kernels of widths of about $600$ MeV and central energies from $220$ MeV up to $2.5$ GeV. Our theoretical results are compared with the corresponding quantities obtained by smearing the KNT19 compilation [2] of $R$-ratio experimental measurements with the same kernels and, by centring the Gaussians in the region around the $蟻$-resonance peak, a tension of about three standard deviations is observed. From the phenomenological perspective, we have not included yet in our calculation QED and strong isospin-breaking corrections and this might affect the observed tension. From the methodological perspective, our calculation demonstrates that it is possible to study the $R$-ratio in Gaussian energy bins on the lattice at the level of accuracy required in order to perform precision tests of the Standard Model. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2212.08467v2-abstract-full').style.display = 'none'; document.getElementById('2212.08467v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 19 May, 2023; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 16 December, 2022; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> December 2022. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">Version accepted for publication on PRL. Results unchanged</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2212.07730">arXiv:2212.07730</a> <span> [<a href="https://arxiv.org/pdf/2212.07730">pdf</a>, <a href="https://arxiv.org/format/2212.07730">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="High Energy Physics - Lattice">hep-lat</span> </div> </div> <p class="title is-5 mathjax"> Non-perturbative renormalization of quark and gluon operators using a gauge-invariant scheme </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-lat?searchtype=author&query=Spanoudes%2C+G">G. Spanoudes</a>, <a href="/search/hep-lat?searchtype=author&query=Alexandrou%2C+C">C. Alexandrou</a>, <a href="/search/hep-lat?searchtype=author&query=Finkenrath%2C+J">J. Finkenrath</a>, <a href="/search/hep-lat?searchtype=author&query=Hadjiyiannakou%2C+K">K. Hadjiyiannakou</a>, <a href="/search/hep-lat?searchtype=author&query=Panagopoulos%2C+H">H. Panagopoulos</a>, <a href="/search/hep-lat?searchtype=author&query=Yamamoto%2C+S">S. Yamamoto</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2212.07730v1-abstract-short" style="display: inline;"> We present preliminary results for the renormalization functions (RFs) of a number of quark and gluon operators studied in lattice QCD using a gauge-invariant renormalization scheme (GIRS). GIRS is a variant of the coordinate-space renormalization prescription, in which Green's functions of gauge-invariant operators are calculated in position space. A novel aspect is that summations over different… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2212.07730v1-abstract-full').style.display = 'inline'; document.getElementById('2212.07730v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2212.07730v1-abstract-full" style="display: none;"> We present preliminary results for the renormalization functions (RFs) of a number of quark and gluon operators studied in lattice QCD using a gauge-invariant renormalization scheme (GIRS). GIRS is a variant of the coordinate-space renormalization prescription, in which Green's functions of gauge-invariant operators are calculated in position space. A novel aspect is that summations over different time slices of the positions of the operators are employed in order to reduce the statistical noise in lattice simulations. We test the reliability of this scheme by calculating RFs for the vector one-derivative quark bilinear operator, which enters the average momentum fraction of the nucleon. We use $N_f=4$ degenerate twisted mass clover-improved fermion ensembles of different volumes and lattice spacings. We also present first results of applying GIRS when operator mixing occurs: the mixing coefficients of the gluon and quark singlet energy-momentum tensor operators are evaluated by imposing appropriate renormalization conditions on the lattice. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2212.07730v1-abstract-full').style.display = 'none'; document.getElementById('2212.07730v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 15 December, 2022; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> December 2022. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">10 pages, 5 figures, 3 tables, Talk at the 39th International Symposium on Lattice Field Theory, LATTICE2022, 8th-13th August, 2022, Rheinische Friedrich-Wilhelms-Universit盲t Bonn, Bonn, Germany</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2212.07057">arXiv:2212.07057</a> <span> [<a href="https://arxiv.org/pdf/2212.07057">pdf</a>, <a href="https://arxiv.org/format/2212.07057">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="High Energy Physics - Lattice">hep-lat</span> </div> </div> <p class="title is-5 mathjax"> Disconnected contribution to the LO HVP term of muon g-2 from ETMC </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-lat?searchtype=author&query=Alexandrou%2C+C">Constantia Alexandrou</a>, <a href="/search/hep-lat?searchtype=author&query=Bacchio%2C+S">Simone Bacchio</a>, <a href="/search/hep-lat?searchtype=author&query=Dimopoulos%2C+P">Petros Dimopoulos</a>, <a href="/search/hep-lat?searchtype=author&query=Finkenrath%2C+J">Jacob Finkenrath</a>, <a href="/search/hep-lat?searchtype=author&query=Frezzotti%2C+R">Roberto Frezzotti</a>, <a href="/search/hep-lat?searchtype=author&query=Gagliardi%2C+G">Giuseppe Gagliardi</a>, <a href="/search/hep-lat?searchtype=author&query=Garofalo%2C+M">Marco Garofalo</a>, <a href="/search/hep-lat?searchtype=author&query=Hadjiyiannakou%2C+K">Kyriakos Hadjiyiannakou</a>, <a href="/search/hep-lat?searchtype=author&query=Kostrzewa%2C+B">Bartosz Kostrzewa</a>, <a href="/search/hep-lat?searchtype=author&query=Jansen%2C+K">Karl Jansen</a>, <a href="/search/hep-lat?searchtype=author&query=Lubicz%2C+V">Vittorio Lubicz</a>, <a href="/search/hep-lat?searchtype=author&query=Petschlies%2C+M">Marcus Petschlies</a>, <a href="/search/hep-lat?searchtype=author&query=Sanfilippo%2C+F">Francesco Sanfilippo</a>, <a href="/search/hep-lat?searchtype=author&query=Simula%2C+S">Silvano Simula</a>, <a href="/search/hep-lat?searchtype=author&query=Urbach%2C+C">Carsten Urbach</a>, <a href="/search/hep-lat?searchtype=author&query=Wenger%2C+U">Urs Wenger</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2212.07057v1-abstract-short" style="display: inline;"> We present a lattice determination of the disconnected contributions to the leading-order hadronic vacuum polarization (HVP) to the muon anomalous magnetic moment in the so-called short and intermediate time-distance windows. We employ gauge ensembles produced by the Extended Twisted Mass Collaboration (ETMC) with $N_f = 2 + 1 + 1$ flavours of Wilson twisted-mass clover-improved quarks with masses… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2212.07057v1-abstract-full').style.display = 'inline'; document.getElementById('2212.07057v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2212.07057v1-abstract-full" style="display: none;"> We present a lattice determination of the disconnected contributions to the leading-order hadronic vacuum polarization (HVP) to the muon anomalous magnetic moment in the so-called short and intermediate time-distance windows. We employ gauge ensembles produced by the Extended Twisted Mass Collaboration (ETMC) with $N_f = 2 + 1 + 1$ flavours of Wilson twisted-mass clover-improved quarks with masses approximately tuned to their physical value. We take the continuum limit employing three lattice spacings at about 0.08, 0.07 and 0.06 fm. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2212.07057v1-abstract-full').style.display = 'none'; document.getElementById('2212.07057v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 14 December, 2022; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> December 2022. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">10 pages, 4 figures, 7 tables, LATTICE 2022</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2212.06704">arXiv:2212.06704</a> <span> [<a href="https://arxiv.org/pdf/2212.06704">pdf</a>, <a href="https://arxiv.org/format/2212.06704">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="High Energy Physics - Lattice">hep-lat</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Phenomenology">hep-ph</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevD.108.054509">10.1103/PhysRevD.108.054509 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> The $畏\rightarrow 纬^* 纬^*$ transition form factor and the hadronic light-by-light $畏$-pole contribution to the muon $g-2$ from lattice QCD </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-lat?searchtype=author&query=Alexandrou%2C+C">Constantia Alexandrou</a>, <a href="/search/hep-lat?searchtype=author&query=Bacchio%2C+S">Simone Bacchio</a>, <a href="/search/hep-lat?searchtype=author&query=Burri%2C+S">Sebastian Burri</a>, <a href="/search/hep-lat?searchtype=author&query=Finkenrath%2C+J">Jacob Finkenrath</a>, <a href="/search/hep-lat?searchtype=author&query=Gasbarro%2C+A">Andrew Gasbarro</a>, <a href="/search/hep-lat?searchtype=author&query=Hadjiyiannakou%2C+K">Kyriakos Hadjiyiannakou</a>, <a href="/search/hep-lat?searchtype=author&query=Jansen%2C+K">Karl Jansen</a>, <a href="/search/hep-lat?searchtype=author&query=Kanwar%2C+G">Gurtej Kanwar</a>, <a href="/search/hep-lat?searchtype=author&query=Kostrzewa%2C+B">Bartosz Kostrzewa</a>, <a href="/search/hep-lat?searchtype=author&query=Ottnad%2C+K">Konstantin Ottnad</a>, <a href="/search/hep-lat?searchtype=author&query=Petschlies%2C+M">Marcus Petschlies</a>, <a href="/search/hep-lat?searchtype=author&query=Pittler%2C+F">Ferenc Pittler</a>, <a href="/search/hep-lat?searchtype=author&query=Urbach%2C+C">Carsten Urbach</a>, <a href="/search/hep-lat?searchtype=author&query=Wenger%2C+U">Urs Wenger</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2212.06704v2-abstract-short" style="display: inline;"> We calculate the double-virtual $畏\rightarrow 纬^* 纬^*$ transition form factor $\mathcal{F}_{畏\to 纬^* 纬^*}(q_1^2,q_2^2)$ from first principles using a lattice QCD simulation with $N_f=2+1+1$ quark flavors at the physical pion mass and at one lattice spacing and volume. The kinematic range covered by our calculation is complementary to the one accessible from experiment and is relevant for the $畏$-p… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2212.06704v2-abstract-full').style.display = 'inline'; document.getElementById('2212.06704v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2212.06704v2-abstract-full" style="display: none;"> We calculate the double-virtual $畏\rightarrow 纬^* 纬^*$ transition form factor $\mathcal{F}_{畏\to 纬^* 纬^*}(q_1^2,q_2^2)$ from first principles using a lattice QCD simulation with $N_f=2+1+1$ quark flavors at the physical pion mass and at one lattice spacing and volume. The kinematic range covered by our calculation is complementary to the one accessible from experiment and is relevant for the $畏$-pole contribution to the hadronic light-by-light scattering in the anomalous magnetic moment $a_渭= (g-2)/2$ of the muon. From the form factor calculation we extract the partial decay width $螕(畏\rightarrow 纬纬) = 323(85)_\text{stat}(22)_\text{syst}$ eV and the slope parameter $b_畏=1.19(36)_\text{stat}(16)_\text{syst}$ GeV${}^{-2}$. For the $畏$-pole contribution to $a_渭$ we obtain $a_渭^{畏-\text{pole}} = 13.2(5.2)_\text{stat}(1.3)_\text{syst} \cdot 10^{-11}$. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2212.06704v2-abstract-full').style.display = 'none'; document.getElementById('2212.06704v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 21 December, 2023; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 13 December, 2022; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> December 2022. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">12 pages, 8 figures; updated to published version</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. D 108 (2023) 054509 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2210.05743">arXiv:2210.05743</a> <span> [<a href="https://arxiv.org/pdf/2210.05743">pdf</a>, <a href="https://arxiv.org/format/2210.05743">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="High Energy Physics - Lattice">hep-lat</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Phenomenology">hep-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Nuclear Theory">nucl-th</span> </div> </div> <p class="title is-5 mathjax"> Nucleon transverse quark spin densities </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-lat?searchtype=author&query=Alexandrou%2C+C">Constantia Alexandrou</a>, <a href="/search/hep-lat?searchtype=author&query=Bacchio%2C+S">Simone Bacchio</a>, <a href="/search/hep-lat?searchtype=author&query=Constantinou%2C+M">Martha Constantinou</a>, <a href="/search/hep-lat?searchtype=author&query=Dimopoulos%2C+P">Petros Dimopoulos</a>, <a href="/search/hep-lat?searchtype=author&query=Finkenrath%2C+J">Jacob Finkenrath</a>, <a href="/search/hep-lat?searchtype=author&query=Frezzotti%2C+R">Roberto Frezzotti</a>, <a href="/search/hep-lat?searchtype=author&query=Hadjiyiannakou%2C+K">Kyriakos Hadjiyiannakou</a>, <a href="/search/hep-lat?searchtype=author&query=Jansen%2C+K">Karl Jansen</a>, <a href="/search/hep-lat?searchtype=author&query=Kostrzewa%2C+B">Bartosz Kostrzewa</a>, <a href="/search/hep-lat?searchtype=author&query=Koutsou%2C+G">Giannis Koutsou</a>, <a href="/search/hep-lat?searchtype=author&query=Spanoudes%2C+G">Gregoris Spanoudes</a>, <a href="/search/hep-lat?searchtype=author&query=Urbach%2C+C">Carsten Urbach</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2210.05743v1-abstract-short" style="display: inline;"> We present a calculation of the Mellin moments of the nucleon transverse quark spin densities extracted from the unpolarized and transversity generalized form factors. We use three $N_F=2+1+1$ ensembles of twisted mass fermions with quark masses tuned to their physical values and lattice spacings $a\sim 0.08$~fm, $a\sim 0.07$~fm and $a\sim 0.06$~fm and extrapolate the form factors to the continuum… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2210.05743v1-abstract-full').style.display = 'inline'; document.getElementById('2210.05743v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2210.05743v1-abstract-full" style="display: none;"> We present a calculation of the Mellin moments of the nucleon transverse quark spin densities extracted from the unpolarized and transversity generalized form factors. We use three $N_F=2+1+1$ ensembles of twisted mass fermions with quark masses tuned to their physical values and lattice spacings $a\sim 0.08$~fm, $a\sim 0.07$~fm and $a\sim 0.06$~fm and extrapolate the form factors to the continuum limit. Besides isovector densities we also include results for the tensor charge for each quark flavor using the ensemble with $a\sim 0.08$~fm for which we include the disconnected contributions. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2210.05743v1-abstract-full').style.display = 'none'; document.getElementById('2210.05743v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 11 October, 2022; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> October 2022. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">9 pages, 6 figures, talk presented at the 39th International Symposium on Lattice Field Theory, LATTICE2022 8th-13th August, 2022, University of Bonn, Germany</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2206.15084">arXiv:2206.15084</a> <span> [<a href="https://arxiv.org/pdf/2206.15084">pdf</a>, <a href="https://arxiv.org/format/2206.15084">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="High Energy Physics - Lattice">hep-lat</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Phenomenology">hep-ph</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevD.107.074506">10.1103/PhysRevD.107.074506 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Lattice calculation of the short and intermediate time-distance hadronic vacuum polarization contributions to the muon magnetic moment using twisted-mass fermions </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-lat?searchtype=author&query=Alexandrou%2C+C">C. Alexandrou</a>, <a href="/search/hep-lat?searchtype=author&query=Bacchio%2C+S">S. Bacchio</a>, <a href="/search/hep-lat?searchtype=author&query=Dimopoulos%2C+P">P. Dimopoulos</a>, <a href="/search/hep-lat?searchtype=author&query=Finkenrath%2C+J">J. Finkenrath</a>, <a href="/search/hep-lat?searchtype=author&query=Frezzotti%2C+R">R. Frezzotti</a>, <a href="/search/hep-lat?searchtype=author&query=Gagliardi%2C+G">G. Gagliardi</a>, <a href="/search/hep-lat?searchtype=author&query=Garofalo%2C+M">M. Garofalo</a>, <a href="/search/hep-lat?searchtype=author&query=Hadjiyiannakou%2C+K">K. Hadjiyiannakou</a>, <a href="/search/hep-lat?searchtype=author&query=Kostrzewa%2C+B">B. Kostrzewa</a>, <a href="/search/hep-lat?searchtype=author&query=Jansen%2C+K">K. Jansen</a>, <a href="/search/hep-lat?searchtype=author&query=Lubicz%2C+V">V. Lubicz</a>, <a href="/search/hep-lat?searchtype=author&query=Petschlies%2C+M">M. Petschlies</a>, <a href="/search/hep-lat?searchtype=author&query=Sanfilippo%2C+F">F. Sanfilippo</a>, <a href="/search/hep-lat?searchtype=author&query=Simula%2C+S">S. Simula</a>, <a href="/search/hep-lat?searchtype=author&query=Urbach%2C+C">C. Urbach</a>, <a href="/search/hep-lat?searchtype=author&query=Wenger%2C+U">U. Wenger</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2206.15084v3-abstract-short" style="display: inline;"> We present a lattice determination of the leading-order hadronic vacuum polarization (HVP) contribution to the muon anomalous magnetic moment, $a_渭^{\rm HVP}$, in the so-called short and intermediate time-distance windows, $a_渭^{\rm SD}$ and $a_渭^{\rm W}$, defined by the RBC/UKQCD Collaboration [1]. We employ gauge ensembles produced by the Extended Twisted Mass Collaboration (ETMC) with… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2206.15084v3-abstract-full').style.display = 'inline'; document.getElementById('2206.15084v3-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2206.15084v3-abstract-full" style="display: none;"> We present a lattice determination of the leading-order hadronic vacuum polarization (HVP) contribution to the muon anomalous magnetic moment, $a_渭^{\rm HVP}$, in the so-called short and intermediate time-distance windows, $a_渭^{\rm SD}$ and $a_渭^{\rm W}$, defined by the RBC/UKQCD Collaboration [1]. We employ gauge ensembles produced by the Extended Twisted Mass Collaboration (ETMC) with $N_f = 2 + 1 + 1$ flavors of Wilson-clover twisted-mass quarks with masses of all the dynamical quark flavors tuned close to their physical values. The simulations are carried out at three values of the lattice spacing equal to $\simeq 0.057, 0.068$ and $0.080$ fm with spatial lattice sizes up to $L \simeq 7.6$~fm. For the short distance window we obtain $a_渭^{\rm SD}({\rm ETMC}) = 69.27\,(34) \cdot 10^{-10}$, which is consistent with the recent dispersive value of $a_渭^{\rm SD}(e^+ e^-) = 68.4\,(5) \cdot 10^{-10}$ [2]. In the case of the intermediate window we get the value $a_渭^{\rm W}({\rm ETMC}) = 236.3\,(1.3) \cdot 10^{-10}$, which is consistent with the result $a_渭^{\rm W}({\rm BMW}) = 236.7\,(1.4) \cdot 10^{-10}$ [3] by the BMW collaboration as well as with the recent determination by the CLS/Mainz group of $a_渭^{\rm W}({\rm CLS}) = 237.30\,(1.46) \cdot 10^{-10}$ [4]. However, it is larger than the dispersive result of $a_渭^{\rm W}(e^+ e^-) = 229.4\,(1.4) \cdot 10^{-10}$ [2] by approximately $3.6$ standard deviations. The tension increases to approximately $4.5$ standard deviations if we average our ETMC result with those by BMW and CLS/Mainz. Our accurate lattice results in the short and intermediate windows point to a possible deviation of the $e^+ e^-$ cross section data with respect to Standard Model predictions in the low and intermediate energy regions, but not in the high energy region. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2206.15084v3-abstract-full').style.display = 'none'; document.getElementById('2206.15084v3-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 29 November, 2022; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 30 June, 2022; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> June 2022. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">78 pages, 22 figures, 14 tables. Analysis improved with more data and fits, presentation reorganized, more material in appendices, fixed typos</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2202.09871">arXiv:2202.09871</a> <span> [<a href="https://arxiv.org/pdf/2202.09871">pdf</a>, <a href="https://arxiv.org/format/2202.09871">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="High Energy Physics - Lattice">hep-lat</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevD.107.054504">10.1103/PhysRevD.107.054504 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> First moments of the nucleon transverse quark spin densities using lattice QCD </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-lat?searchtype=author&query=Alexandrou%2C+C">C. Alexandrou</a>, <a href="/search/hep-lat?searchtype=author&query=Bacchio%2C+S">S. Bacchio</a>, <a href="/search/hep-lat?searchtype=author&query=Constantinou%2C+M">M. Constantinou</a>, <a href="/search/hep-lat?searchtype=author&query=Dimopoulos%2C+P">P. Dimopoulos</a>, <a href="/search/hep-lat?searchtype=author&query=Finkenrath%2C+J">J. Finkenrath</a>, <a href="/search/hep-lat?searchtype=author&query=Frezzotti%2C+R">R. Frezzotti</a>, <a href="/search/hep-lat?searchtype=author&query=Hadjiyiannakou%2C+K">K. Hadjiyiannakou</a>, <a href="/search/hep-lat?searchtype=author&query=Jansen%2C+K">K. Jansen</a>, <a href="/search/hep-lat?searchtype=author&query=Kostrzewa%2C+B">B. Kostrzewa</a>, <a href="/search/hep-lat?searchtype=author&query=Koutsou%2C+G">G. Koutsou</a>, <a href="/search/hep-lat?searchtype=author&query=Spanoudes%2C+G">G. Spanoudes</a>, <a href="/search/hep-lat?searchtype=author&query=Urbach%2C+C">C. Urbach</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2202.09871v1-abstract-short" style="display: inline;"> We present a calculation of the Mellin moments of the transverse quark spin densities in the nucleon using lattice QCD. The densities are extracted from the unpolarized and transversity generalized form factors extrapolated to the continuum limit using three $N_f=2+1+1$ twisted mass fermion gauge ensembles simulated with physical quark masses and spanning three lattice spacings. The first moment o… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2202.09871v1-abstract-full').style.display = 'inline'; document.getElementById('2202.09871v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2202.09871v1-abstract-full" style="display: none;"> We present a calculation of the Mellin moments of the transverse quark spin densities in the nucleon using lattice QCD. The densities are extracted from the unpolarized and transversity generalized form factors extrapolated to the continuum limit using three $N_f=2+1+1$ twisted mass fermion gauge ensembles simulated with physical quark masses and spanning three lattice spacings. The first moment of transversely polarized quarks in an unpolarized nucleon shows an interesting distortion, which can be traced back to the sharp falloff of the transversity generalized form factor $\bar{B}_{Tn0}(t)$. The isovector tensor anomalous magnetic moment is determined to be $魏_T=1.051(94)$, which confirms a negative and large Boer-Mulders function, $h_1^{\perp}$, in the nucleon. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2202.09871v1-abstract-full').style.display = 'none'; document.getElementById('2202.09871v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 20 February, 2022; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> February 2022. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2201.06519">arXiv:2201.06519</a> <span> [<a href="https://arxiv.org/pdf/2201.06519">pdf</a>, <a href="https://arxiv.org/format/2201.06519">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="High Energy Physics - Lattice">hep-lat</span> </div> </div> <p class="title is-5 mathjax"> Proton generalized parton distributions from lattice QCD </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-lat?searchtype=author&query=Scapellato%2C+A">Aurora Scapellato</a>, <a href="/search/hep-lat?searchtype=author&query=Alexandrou%2C+C">Constantia Alexandrou</a>, <a href="/search/hep-lat?searchtype=author&query=Cichy%2C+K">Krzysztof Cichy</a>, <a href="/search/hep-lat?searchtype=author&query=Constantinou%2C+M">Martha Constantinou</a>, <a href="/search/hep-lat?searchtype=author&query=Hadjiyiannakou%2C+K">Kyriakos Hadjiyiannakou</a>, <a href="/search/hep-lat?searchtype=author&query=Jansen%2C+K">Karl Jansen</a>, <a href="/search/hep-lat?searchtype=author&query=Steffens%2C+F">Fernanda Steffens</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2201.06519v1-abstract-short" style="display: inline;"> Momentum and spatial distributions of quarks and gluons inside hadrons are typically encoded in the so-called generalized parton distributions (GPDs). GPDs are multi-dimensional quantities that are very challenging to extract, both experimentally and within lattice QCD. We present the first lattice results on the $x$-dependence of isovector unpolarized, helicity and transversity GPDs of the proton… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2201.06519v1-abstract-full').style.display = 'inline'; document.getElementById('2201.06519v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2201.06519v1-abstract-full" style="display: none;"> Momentum and spatial distributions of quarks and gluons inside hadrons are typically encoded in the so-called generalized parton distributions (GPDs). GPDs are multi-dimensional quantities that are very challenging to extract, both experimentally and within lattice QCD. We present the first lattice results on the $x$-dependence of isovector unpolarized, helicity and transversity GPDs of the proton, obtained from lattice QCD using an ensemble of $N_f=2+1+1$ maximally twisted mass fermions, with pion mass $M_蟺=260$ MeV and lattice spacing $a\simeq 0.093$ fm. Our calculations use the quasi-distribution formalism and the final distributions are presented in the MS-bar scheme at a renormalization scale of 2 GeV. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2201.06519v1-abstract-full').style.display = 'none'; document.getElementById('2201.06519v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 17 January, 2022; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> January 2022. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">Invited talk at the Hadron 2021 conference. 7 pages, 4 figures</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2112.06750">arXiv:2112.06750</a> <span> [<a href="https://arxiv.org/pdf/2112.06750">pdf</a>, <a href="https://arxiv.org/format/2112.06750">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="High Energy Physics - Lattice">hep-lat</span> </div> </div> <p class="title is-5 mathjax"> Nucleon form factors from $N_f$=2+1+1 twisted mass QCD at the physical point </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-lat?searchtype=author&query=Alexandrou%2C+C">Constantia Alexandrou</a>, <a href="/search/hep-lat?searchtype=author&query=Bacchio%2C+S">Simone Bacchio</a>, <a href="/search/hep-lat?searchtype=author&query=Constantinou%2C+M">Martha Constantinou</a>, <a href="/search/hep-lat?searchtype=author&query=Finkenrath%2C+J">Jacob Finkenrath</a>, <a href="/search/hep-lat?searchtype=author&query=Hadjiyiannakou%2C+K">Kyriakos Hadjiyiannakou</a>, <a href="/search/hep-lat?searchtype=author&query=Jansen%2C+K">Karl Jansen</a>, <a href="/search/hep-lat?searchtype=author&query=Koutsou%2C+G">Giannis Koutsou</a>, <a href="/search/hep-lat?searchtype=author&query=Vaquero%2C+A">Alejandro Vaquero</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2112.06750v1-abstract-short" style="display: inline;"> We present the nucleon axial and electromagnetic form factors using \Nf{2}{1}{1} ensembles of twisted mass fermions with clover improvement and with masses tuned to their physical values. Excited state effects are studied using several sink-source time separations in the range 0.8 fm - 1.6 fm, exponentially increasing statistics with the separation such that statistical errors remain approximately… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2112.06750v1-abstract-full').style.display = 'inline'; document.getElementById('2112.06750v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2112.06750v1-abstract-full" style="display: none;"> We present the nucleon axial and electromagnetic form factors using \Nf{2}{1}{1} ensembles of twisted mass fermions with clover improvement and with masses tuned to their physical values. Excited state effects are studied using several sink-source time separations in the range 0.8 fm - 1.6 fm, exponentially increasing statistics with the separation such that statistical errors remain approximately constant. In addition, quark loop disconnected diagrams are included in order to extract the isoscalar axial form factors and the proton and neutron electromagnetic form factors, as well as their strange-quark contributions. The radii and moments are extracted by modelling the $Q^2$ dependence, including using the so-called $z$-expansion. A preliminary assessment of lattice cut-off effects is presented using two lattice spacings directly at the physical point. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2112.06750v1-abstract-full').style.display = 'none'; document.getElementById('2112.06750v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 13 December, 2021; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> December 2021. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">12 pages, 10 figures, 2 tables; proceedings of the 38th International Symposium on Lattice Field Theory (LATTICE2021), 26th-30th July, 2021, Zoom/Gather@Massachusetts Institute of Technology</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2112.03953">arXiv:2112.03953</a> <span> [<a href="https://arxiv.org/pdf/2112.03953">pdf</a>, <a href="https://arxiv.org/format/2112.03953">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="High Energy Physics - Lattice">hep-lat</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Phenomenology">hep-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Nuclear Theory">nucl-th</span> </div> </div> <p class="title is-5 mathjax"> Pion and kaon form factors using twisted-mass fermions </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-lat?searchtype=author&query=Alexandrou%2C+C">Constantia Alexandrou</a>, <a href="/search/hep-lat?searchtype=author&query=Bacchio%2C+S">Simone Bacchio</a>, <a href="/search/hep-lat?searchtype=author&query=Clo%C3%ABt%2C+I">Ian Clo毛t</a>, <a href="/search/hep-lat?searchtype=author&query=Constantinou%2C+M">Martha Constantinou</a>, <a href="/search/hep-lat?searchtype=author&query=Delmar%2C+J">Joseph Delmar</a>, <a href="/search/hep-lat?searchtype=author&query=Hadjiyiannakou%2C+K">Kyriakos Hadjiyiannakou</a>, <a href="/search/hep-lat?searchtype=author&query=Koutsou%2C+G">Giannis Koutsou</a>, <a href="/search/hep-lat?searchtype=author&query=Lauer%2C+C">Colin Lauer</a>, <a href="/search/hep-lat?searchtype=author&query=Avil%C3%A9s-Casco%2C+A+V">Alejandro Vaquero Avil茅s-Casco</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2112.03953v1-abstract-short" style="display: inline;"> We present a calculation of the scalar, vector and tensor pion and kaon form factors using one ensemble of two degenerate light, a strange and a charm quark ($N_f=2+1+1$) of maximally twisted mass fermions with clover improvement. The quark masses are chosen so that they produce a pion mass of about 265 MeV, and a kaon mass of 530 MeV. The lattice spacing of the ensemble is 0.093 fm and the lattic… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2112.03953v1-abstract-full').style.display = 'inline'; document.getElementById('2112.03953v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2112.03953v1-abstract-full" style="display: none;"> We present a calculation of the scalar, vector and tensor pion and kaon form factors using one ensemble of two degenerate light, a strange and a charm quark ($N_f=2+1+1$) of maximally twisted mass fermions with clover improvement. The quark masses are chosen so that they produce a pion mass of about 265 MeV, and a kaon mass of 530 MeV. The lattice spacing of the ensemble is 0.093 fm and the lattice has a spatial extent of 3 fm. We use a rest frame, as well as a boosted frame to obtain the form factors for a wider and denser set of four-vector momentum transfer squared, $Q^2$. To assess and eliminate excited-states contamination, we analyze several values of the source-sink time separation within the range of 1.12 - 2.23 fm (1.12 - 1.67 fm) for the rest (boosted) frame. The $Q^2$ dependence of the form factors is parametrized using a monopole fit, which leads to the extraction of the corresponding radius, and the tensor anomalous magnetic moment for the tensor form factor. The results for these parametrizations are compared for the pion and kaon to assess the level of the SU(3) flavor symmetry breaking. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2112.03953v1-abstract-full').style.display = 'none'; document.getElementById('2112.03953v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 7 December, 2021; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> December 2021. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">10 pages, 6 figures, Proceedings of the 38th Annual International Symposium on Lattice Field Theory - LATTICE2021</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2112.03952">arXiv:2112.03952</a> <span> [<a href="https://arxiv.org/pdf/2112.03952">pdf</a>, <a href="https://arxiv.org/format/2112.03952">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="High Energy Physics - Lattice">hep-lat</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Phenomenology">hep-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Nuclear Theory">nucl-th</span> </div> </div> <p class="title is-5 mathjax"> $x$-dependence reconstruction of pion and kaon PDFs from Mellin moments </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-lat?searchtype=author&query=Alexandrou%2C+C">Constantia Alexandrou</a>, <a href="/search/hep-lat?searchtype=author&query=Bacchio%2C+S">Simone Bacchio</a>, <a href="/search/hep-lat?searchtype=author&query=Clo%C3%ABt%2C+I">Ian Clo毛t</a>, <a href="/search/hep-lat?searchtype=author&query=Constantinou%2C+M">Martha Constantinou</a>, <a href="/search/hep-lat?searchtype=author&query=Hadjiyiannakou%2C+K">Kyriakos Hadjiyiannakou</a>, <a href="/search/hep-lat?searchtype=author&query=Koutsou%2C+G">Giannis Koutsou</a>, <a href="/search/hep-lat?searchtype=author&query=Lauer%2C+C">Colin Lauer</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2112.03952v1-abstract-short" style="display: inline;"> We present a calculation of the connected-diagram contributions to the first three non-trivial Mellin moments for the pion and kaon, extracted using local operators with up to 3 covariant derivatives. We use one ensemble of gauge configurations with two degenerate light, a strange and a charm quark ($N_f$=2+1+1) of maximally twisted mass fermions with clover improvement. The ensemble has a pion ma… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2112.03952v1-abstract-full').style.display = 'inline'; document.getElementById('2112.03952v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2112.03952v1-abstract-full" style="display: none;"> We present a calculation of the connected-diagram contributions to the first three non-trivial Mellin moments for the pion and kaon, extracted using local operators with up to 3 covariant derivatives. We use one ensemble of gauge configurations with two degenerate light, a strange and a charm quark ($N_f$=2+1+1) of maximally twisted mass fermions with clover improvement. The ensemble has a pion mass $\sim$260 MeV, and a kaon mass $\sim$530 MeV. We reconstruct the $x$-dependence of the PDFs via fits to our results, and find that our lattice data favor a $(1-x)^2$-behavior in the large-$x$ region for both the pion and kaon PDFs. We integrate the reconstructed PDFs to extract the higher moments, $\langle x^n \rangle$, with $4 \leq n \leq 6$. Finally, we compare the pion and kaon PDFs, as well as the ratios of their Mellin moments, to address the effect of SU(3) flavor symmetry breaking. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2112.03952v1-abstract-full').style.display = 'none'; document.getElementById('2112.03952v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 7 December, 2021; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> December 2021. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">11 pages, 5 figures, Proceedings of the 38th Annual International Symposium on Lattice Field Theory - LATTICE2021</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2112.03586">arXiv:2112.03586</a> <span> [<a href="https://arxiv.org/pdf/2112.03586">pdf</a>, <a href="https://arxiv.org/format/2112.03586">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="High Energy Physics - Lattice">hep-lat</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.22323/1.396.0519">10.22323/1.396.0519 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Pion-pole contribution to HLbL from twisted mass lattice QCD at the physical point </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-lat?searchtype=author&query=Burri%2C+S">Sebastian Burri</a>, <a href="/search/hep-lat?searchtype=author&query=Alexandrou%2C+C">Constantia Alexandrou</a>, <a href="/search/hep-lat?searchtype=author&query=Bacchio%2C+S">Simone Bacchio</a>, <a href="/search/hep-lat?searchtype=author&query=Bergner%2C+G">Georg Bergner</a>, <a href="/search/hep-lat?searchtype=author&query=Finkenrath%2C+J">Jacob Finkenrath</a>, <a href="/search/hep-lat?searchtype=author&query=Gasbarro%2C+A">Andrew Gasbarro</a>, <a href="/search/hep-lat?searchtype=author&query=Hadjiyiannakou%2C+K">Kyriakos Hadjiyiannakou</a>, <a href="/search/hep-lat?searchtype=author&query=Jansen%2C+K">Karl Jansen</a>, <a href="/search/hep-lat?searchtype=author&query=Kostrzewa%2C+B">Bartosz Kostrzewa</a>, <a href="/search/hep-lat?searchtype=author&query=Koutsou%2C+G">Giannis Koutsou</a>, <a href="/search/hep-lat?searchtype=author&query=Ottnad%2C+K">Konstantin Ottnad</a>, <a href="/search/hep-lat?searchtype=author&query=Petschlies%2C+M">Marcus Petschlies</a>, <a href="/search/hep-lat?searchtype=author&query=Pittler%2C+F">Ferenc Pittler</a>, <a href="/search/hep-lat?searchtype=author&query=Steffens%2C+F">Fernanda Steffens</a>, <a href="/search/hep-lat?searchtype=author&query=Urbach%2C+C">Carsten Urbach</a>, <a href="/search/hep-lat?searchtype=author&query=Wenger%2C+U">Urs Wenger</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2112.03586v3-abstract-short" style="display: inline;"> We report on our computation of the pion transition form factor ${\cal F}_{P\rightarrow 纬^*纬^*}$ from twisted mass lattice QCD in order to determine the numerically dominant light pseudoscalar pole contribution in the hadronic light-by-light scattering contribution to the anomalous magnetic moment of the muon $a_渭=(g-2)_渭$. The pion transition form factor is computed directly at the physical point… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2112.03586v3-abstract-full').style.display = 'inline'; document.getElementById('2112.03586v3-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2112.03586v3-abstract-full" style="display: none;"> We report on our computation of the pion transition form factor ${\cal F}_{P\rightarrow 纬^*纬^*}$ from twisted mass lattice QCD in order to determine the numerically dominant light pseudoscalar pole contribution in the hadronic light-by-light scattering contribution to the anomalous magnetic moment of the muon $a_渭=(g-2)_渭$. The pion transition form factor is computed directly at the physical point. We present first results for our estimate of the pion-pole contribution with kinematic setup for the pion at rest. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2112.03586v3-abstract-full').style.display = 'none'; document.getElementById('2112.03586v3-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 2 May, 2022; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 7 December, 2021; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> December 2021. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">9 pages, 7 figures; Proceedings of the 38th International Symposium on Lattice Field Theory - Lattice 2021, Zoom/Gather@Massachusetts Institute of Technology</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2111.08135">arXiv:2111.08135</a> <span> [<a href="https://arxiv.org/pdf/2111.08135">pdf</a>, <a href="https://arxiv.org/format/2111.08135">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="High Energy Physics - Lattice">hep-lat</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Phenomenology">hep-ph</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevD.105.054502">10.1103/PhysRevD.105.054502 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> The scalar, vector and tensor form factors for the pion and kaon from lattice QCD </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-lat?searchtype=author&query=Alexandrou%2C+C">Constantia Alexandrou</a>, <a href="/search/hep-lat?searchtype=author&query=Bacchio%2C+S">Simone Bacchio</a>, <a href="/search/hep-lat?searchtype=author&query=Cloet%2C+I">Ian Cloet</a>, <a href="/search/hep-lat?searchtype=author&query=Constantinou%2C+M">Martha Constantinou</a>, <a href="/search/hep-lat?searchtype=author&query=Delmar%2C+J">Joseph Delmar</a>, <a href="/search/hep-lat?searchtype=author&query=Hadjiyiannakou%2C+K">Kyriakos Hadjiyiannakou</a>, <a href="/search/hep-lat?searchtype=author&query=Koutsou%2C+G">Giannis Koutsou</a>, <a href="/search/hep-lat?searchtype=author&query=Lauer%2C+C">Colin Lauer</a>, <a href="/search/hep-lat?searchtype=author&query=Vaquero%2C+A">Alejandro Vaquero</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2111.08135v1-abstract-short" style="display: inline;"> We present a calculation of the scalar, vector, and tensor form factors for the pion and kaon in lattice QCD. We use an ensemble of two degenerate light, a strange and a charm quark ($N_f=2+1+1$) of maximally twisted mass fermions with clover improvement. The corresponding pion and kaon masses are about 265 MeV and 530 MeV, respectively. The calculation is done in both rest and boosted frames obta… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2111.08135v1-abstract-full').style.display = 'inline'; document.getElementById('2111.08135v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2111.08135v1-abstract-full" style="display: none;"> We present a calculation of the scalar, vector, and tensor form factors for the pion and kaon in lattice QCD. We use an ensemble of two degenerate light, a strange and a charm quark ($N_f=2+1+1$) of maximally twisted mass fermions with clover improvement. The corresponding pion and kaon masses are about 265 MeV and 530 MeV, respectively. The calculation is done in both rest and boosted frames obtaining data for four-vector momentum transfer squared up to $-q^2=2.5$ GeV$^2$ for the pion and 3 GeV$^2$ for the kaon. The excited-states effects are studied by analyzing six values of the source-sink time separation for the rest frame ($1.12-2.23$ fm) and for four values for the boosted frame ($1.12-1.67$ fm). The lattice data are renormalized non-perturbatively and the results for the scheme- and scale-dependent scalar and tensor form factors are presented in the $\overline{\rm MS}$ scheme at a scale of 2 GeV. We apply different parametrizations to describe $q^2$-dependence of the form factors to extract the scalar, vector, and tensor radii, as well as the tensor anomalous magnetic moment. We compare the pion and kaon form factors to study SU(3) flavor symmetry breaking effects. By combining the data for the vector and tensor form factors we also obtain the lowest moment of the densities of transversely polarized quarks in the impact parameter space. Finally, we give an estimate for the average transverse shift in the $y$ direction for polarized quarks in the $x$ direction. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2111.08135v1-abstract-full').style.display = 'none'; document.getElementById('2111.08135v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 15 November, 2021; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> November 2021. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">28 pages, 23 pages, 9 tables</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2111.03226">arXiv:2111.03226</a> <span> [<a href="https://arxiv.org/pdf/2111.03226">pdf</a>, <a href="https://arxiv.org/format/2111.03226">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="High Energy Physics - Lattice">hep-lat</span> </div> </div> <p class="title is-5 mathjax"> Generalized parton distributions of the proton from lattice QCD </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-lat?searchtype=author&query=Alexandrou%2C+C">Constantia Alexandrou</a>, <a href="/search/hep-lat?searchtype=author&query=Cichy%2C+K">Krzysztof Cichy</a>, <a href="/search/hep-lat?searchtype=author&query=Constantinou%2C+M">Martha Constantinou</a>, <a href="/search/hep-lat?searchtype=author&query=Hadjiyiannakou%2C+K">Kyriakos Hadjiyiannakou</a>, <a href="/search/hep-lat?searchtype=author&query=Jansen%2C+K">Karl Jansen</a>, <a href="/search/hep-lat?searchtype=author&query=Scapellato%2C+A">Aurora Scapellato</a>, <a href="/search/hep-lat?searchtype=author&query=Steffens%2C+F">Fernanda Steffens</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2111.03226v1-abstract-short" style="display: inline;"> Generalized parton distributions (GPDs) are among the most fundamental quantities for describing the internal structure of hadrons. In this work, we present results on isovector GPDs of the proton obtained within lattice Quantum Chromodynamics. We use the quasi-distribution formalism and perform the calculations on an ensemble of $N_f = 2 + 1 + 1$ twisted mass fermions, with pion mass $M_蟺=260$~Me… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2111.03226v1-abstract-full').style.display = 'inline'; document.getElementById('2111.03226v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2111.03226v1-abstract-full" style="display: none;"> Generalized parton distributions (GPDs) are among the most fundamental quantities for describing the internal structure of hadrons. In this work, we present results on isovector GPDs of the proton obtained within lattice Quantum Chromodynamics. We use the quasi-distribution formalism and perform the calculations on an ensemble of $N_f = 2 + 1 + 1$ twisted mass fermions, with pion mass $M_蟺=260$~MeV and lattice spacing $a\simeq 0.093$~fm. Results are presented for unpolarized, helicity, and transversity GPDs at zero and nonzero skewness with controlled statistical uncertainties. Comparisons with their forward limit show qualitative features anticipated from model calculations. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2111.03226v1-abstract-full').style.display = 'none'; document.getElementById('2111.03226v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 4 November, 2021; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> November 2021. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">Talk at the 38th International Symposium on Lattice Field Theory (LATTICE 2021), 26th-30th July, 2021, Zoom/Gather@Massachusetts Institute of Technology</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2110.04588">arXiv:2110.04588</a> <span> [<a href="https://arxiv.org/pdf/2110.04588">pdf</a>, <a href="https://arxiv.org/format/2110.04588">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="High Energy Physics - Lattice">hep-lat</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Phenomenology">hep-ph</span> </div> </div> <p class="title is-5 mathjax"> Determination of the light, strange and charm quark masses using twisted mass fermions </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-lat?searchtype=author&query=Alexandrou%2C+C">C. Alexandrou</a>, <a href="/search/hep-lat?searchtype=author&query=Bacchio%2C+S">S. Bacchio</a>, <a href="/search/hep-lat?searchtype=author&query=Bergner%2C+G">G. Bergner</a>, <a href="/search/hep-lat?searchtype=author&query=Constantinou%2C+M">M. Constantinou</a>, <a href="/search/hep-lat?searchtype=author&query=Di+Carlo%2C+M">M. Di Carlo</a>, <a href="/search/hep-lat?searchtype=author&query=Dimopoulos%2C+P">P. Dimopoulos</a>, <a href="/search/hep-lat?searchtype=author&query=Finkenrath%2C+J">J. Finkenrath</a>, <a href="/search/hep-lat?searchtype=author&query=Fiorenza%2C+E">E. Fiorenza</a>, <a href="/search/hep-lat?searchtype=author&query=Frezzotti%2C+R">R. Frezzotti</a>, <a href="/search/hep-lat?searchtype=author&query=Garofalo%2C+M">M. Garofalo</a>, <a href="/search/hep-lat?searchtype=author&query=Hadjiyiannakou%2C+K">K. Hadjiyiannakou</a>, <a href="/search/hep-lat?searchtype=author&query=Kostrzewa%2C+B">B. Kostrzewa</a>, <a href="/search/hep-lat?searchtype=author&query=Koutsou%2C+G">G. Koutsou</a>, <a href="/search/hep-lat?searchtype=author&query=Jansen%2C+K">K. Jansen</a>, <a href="/search/hep-lat?searchtype=author&query=Lubicz%2C+V">V. Lubicz</a>, <a href="/search/hep-lat?searchtype=author&query=Mangin-Brinet%2C+M">M. Mangin-Brinet</a>, <a href="/search/hep-lat?searchtype=author&query=Manigrasso%2C+F">F. Manigrasso</a>, <a href="/search/hep-lat?searchtype=author&query=Martinelli%2C+G">G. Martinelli</a>, <a href="/search/hep-lat?searchtype=author&query=Pittler%2C+F">F. Pittler</a>, <a href="/search/hep-lat?searchtype=author&query=Rossi%2C+G+C">G. C. Rossi</a>, <a href="/search/hep-lat?searchtype=author&query=Sanfilippo%2C+F">F. Sanfilippo</a>, <a href="/search/hep-lat?searchtype=author&query=Simula%2C+S">S. Simula</a>, <a href="/search/hep-lat?searchtype=author&query=Tarantino%2C+C">C. Tarantino</a>, <a href="/search/hep-lat?searchtype=author&query=Todaro%2C+A">A. Todaro</a>, <a href="/search/hep-lat?searchtype=author&query=Urbach%2C+C">C. Urbach</a> , et al. (1 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2110.04588v1-abstract-short" style="display: inline;"> We present results for the light, strange and charm quark masses using $N_f=2+1+1$ twisted mass fermion ensembles at three values of the lattice spacing, including two ensembles simulated with the physical value of the pion mass. The analysis is done both in the meson and baryon sectors. The difference in the mean values found in the two sectors is included as part of the systematic error. The pre… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2110.04588v1-abstract-full').style.display = 'inline'; document.getElementById('2110.04588v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2110.04588v1-abstract-full" style="display: none;"> We present results for the light, strange and charm quark masses using $N_f=2+1+1$ twisted mass fermion ensembles at three values of the lattice spacing, including two ensembles simulated with the physical value of the pion mass. The analysis is done both in the meson and baryon sectors. The difference in the mean values found in the two sectors is included as part of the systematic error. The presentation is based on the work of Ref. [1], where more details can be found. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2110.04588v1-abstract-full').style.display = 'none'; document.getElementById('2110.04588v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 9 October, 2021; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> October 2021. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">Talk presented at the 38th International Symposium on Lattice Field Theory, Lattice 2021, Zoom/Gather@Massachusetts Institute of Technology, 26-30 Jul. 2021; 8 pages, 5 figures</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2109.10692">arXiv:2109.10692</a> <span> [<a href="https://arxiv.org/pdf/2109.10692">pdf</a>, <a href="https://arxiv.org/format/2109.10692">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="High Energy Physics - Lattice">hep-lat</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Phenomenology">hep-ph</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevLett.127.252001">10.1103/PhysRevLett.127.252001 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Quark and gluon momentum fractions in the pion from $N_f=2+1+1$ lattice QCD </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-lat?searchtype=author&query=Alexandrou%2C+C">Constantia Alexandrou</a>, <a href="/search/hep-lat?searchtype=author&query=Bacchio%2C+S">Simone Bacchio</a>, <a href="/search/hep-lat?searchtype=author&query=Bergner%2C+G">Georg Bergner</a>, <a href="/search/hep-lat?searchtype=author&query=Finkenrath%2C+J">Jacob Finkenrath</a>, <a href="/search/hep-lat?searchtype=author&query=Gasbarro%2C+A">Andrew Gasbarro</a>, <a href="/search/hep-lat?searchtype=author&query=Hadjiyiannakou%2C+K">Kyriakos Hadjiyiannakou</a>, <a href="/search/hep-lat?searchtype=author&query=Jansen%2C+K">Karl Jansen</a>, <a href="/search/hep-lat?searchtype=author&query=Kostrzewa%2C+B">Bartosz Kostrzewa</a>, <a href="/search/hep-lat?searchtype=author&query=Ottnad%2C+K">Konstantin Ottnad</a>, <a href="/search/hep-lat?searchtype=author&query=Petschlies%2C+M">Marcus Petschlies</a>, <a href="/search/hep-lat?searchtype=author&query=Pittler%2C+F">Ferenc Pittler</a>, <a href="/search/hep-lat?searchtype=author&query=Steffens%2C+F">Fernanda Steffens</a>, <a href="/search/hep-lat?searchtype=author&query=Urbach%2C+C">Carsten Urbach</a>, <a href="/search/hep-lat?searchtype=author&query=Wenger%2C+U">Urs Wenger</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2109.10692v1-abstract-short" style="display: inline;"> We perform the first full decomposition of the pion momentum into its gluon and quark contributions. We employ an ensemble generated by the Extended Twisted Mass Collaboration with $N_f=2 + 1 +1$ Wilson twisted mass clover fermions at maximal twist tuned to reproduce the physical pion mass. We present our results in the $\overline{\mathrm{MS}}$ scheme at $2\gev$. We find $\avgx_{u+d}=0.601(28)$,… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2109.10692v1-abstract-full').style.display = 'inline'; document.getElementById('2109.10692v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2109.10692v1-abstract-full" style="display: none;"> We perform the first full decomposition of the pion momentum into its gluon and quark contributions. We employ an ensemble generated by the Extended Twisted Mass Collaboration with $N_f=2 + 1 +1$ Wilson twisted mass clover fermions at maximal twist tuned to reproduce the physical pion mass. We present our results in the $\overline{\mathrm{MS}}$ scheme at $2\gev$. We find $\avgx_{u+d}=0.601(28)$, $\avgx_s=0.059(13)$, $\avgx_c=0.019(05)$, and $\avgx_g=0.52(11)$ for the separate contributions, respectively, whose sum saturates the momentum sum rule. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2109.10692v1-abstract-full').style.display = 'none'; document.getElementById('2109.10692v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 22 September, 2021; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> September 2021. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2108.10789">arXiv:2108.10789</a> <span> [<a href="https://arxiv.org/pdf/2108.10789">pdf</a>, <a href="https://arxiv.org/format/2108.10789">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="High Energy Physics - Lattice">hep-lat</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Phenomenology">hep-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Theory">hep-th</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Nuclear Theory">nucl-th</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevD.105.034501">10.1103/PhysRevD.105.034501 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Transversity GPDs of the proton from lattice QCD </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-lat?searchtype=author&query=Alexandrou%2C+C">Constantia Alexandrou</a>, <a href="/search/hep-lat?searchtype=author&query=Cichy%2C+K">Krzysztof Cichy</a>, <a href="/search/hep-lat?searchtype=author&query=Constantinou%2C+M">Martha Constantinou</a>, <a href="/search/hep-lat?searchtype=author&query=Hadjiyiannakou%2C+K">Kyriakos Hadjiyiannakou</a>, <a href="/search/hep-lat?searchtype=author&query=Jansen%2C+K">Karl Jansen</a>, <a href="/search/hep-lat?searchtype=author&query=Scapellato%2C+A">Aurora Scapellato</a>, <a href="/search/hep-lat?searchtype=author&query=Steffens%2C+F">Fernanda Steffens</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2108.10789v2-abstract-short" style="display: inline;"> We present the first calculation of the $x$-dependence of the isovector transversity generalized parton distributions (GPDs) for the proton within lattice QCD. We compute the matrix elements with non-local operators containing a Wilson line. The calculation implements the Breit symmetric frame. The proton momenta are chosen as $0.83,\,1.25,\,1.67$ GeV, and the values of the momentum transfer squar… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2108.10789v2-abstract-full').style.display = 'inline'; document.getElementById('2108.10789v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2108.10789v2-abstract-full" style="display: none;"> We present the first calculation of the $x$-dependence of the isovector transversity generalized parton distributions (GPDs) for the proton within lattice QCD. We compute the matrix elements with non-local operators containing a Wilson line. The calculation implements the Breit symmetric frame. The proton momenta are chosen as $0.83,\,1.25,\,1.67$ GeV, and the values of the momentum transfer squared are $0.69,\,1.02$ GeV$^2$. These combinations include cases with zero and nonzero skewness. The calculation is performed using one ensemble of two degenerate-mass light, a strange and a charm quark of maximally twisted mass fermions with a clover term. The lattice results are renormalized non-perturbatively and finally matched to the light-cone GPDs using one-loop perturbation theory within the framework of large momentum effective theory. The final GPDs are given in the $\overline{\rm MS}$ scheme at a scale of 2 GeV. In addition to the individual GPDs, we form the combination of the transversity GPDs that is related to the transverse spin structure of the proton. Finally, we extract the lowest two moments of GPDs and draw a number of important qualitative conclusions. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2108.10789v2-abstract-full').style.display = 'none'; document.getElementById('2108.10789v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 28 January, 2022; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 24 August, 2021; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> August 2021. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">24 pages, 11 figures, version accepted in Phys. Rev. D</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2106.16065">arXiv:2106.16065</a> <span> [<a href="https://arxiv.org/pdf/2106.16065">pdf</a>, <a href="https://arxiv.org/format/2106.16065">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="High Energy Physics - Lattice">hep-lat</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Phenomenology">hep-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Nuclear Theory">nucl-th</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevD.104.054503">10.1103/PhysRevD.104.054503 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Flavor decomposition of the nucleon unpolarized, helicity and transversity parton distribution functions from lattice QCD simulations </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-lat?searchtype=author&query=Alexandrou%2C+C">Constantia Alexandrou</a>, <a href="/search/hep-lat?searchtype=author&query=Constantinou%2C+M">Martha Constantinou</a>, <a href="/search/hep-lat?searchtype=author&query=Hadjiyiannakou%2C+K">Kyriakos Hadjiyiannakou</a>, <a href="/search/hep-lat?searchtype=author&query=Jansen%2C+K">Karl Jansen</a>, <a href="/search/hep-lat?searchtype=author&query=Manigrasso%2C+F">Floriano Manigrasso</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2106.16065v1-abstract-short" style="display: inline;"> We present results on the quark unpolarized, helicity and transversity parton distributions functions of the nucleon. We use the quasi-parton distribution approach within the lattice QCD framework and perform the computation using an ensemble of twisted mass fermions with the strange and charm quark masses tuned to approximately their physical values and light quark masses giving pion mass of 260… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2106.16065v1-abstract-full').style.display = 'inline'; document.getElementById('2106.16065v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2106.16065v1-abstract-full" style="display: none;"> We present results on the quark unpolarized, helicity and transversity parton distributions functions of the nucleon. We use the quasi-parton distribution approach within the lattice QCD framework and perform the computation using an ensemble of twisted mass fermions with the strange and charm quark masses tuned to approximately their physical values and light quark masses giving pion mass of 260 MeV. We use hierarchical probing to evaluate the disconnected quark loops. We discuss identification of ground state dominance, the Fourier transform procedure and convergence with the momentum boost. We find non-zero results for the disconnected isoscalar and strange quark distributions. The determination of the quark parton distribution and in particular the strange quark contributions that are poorly known provide valuable input to the structure of the nucleon. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2106.16065v1-abstract-full').style.display = 'none'; document.getElementById('2106.16065v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 30 June, 2021; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> June 2021. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">32 pages and 16 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. D 104, 054503 (2021) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2106.13468">arXiv:2106.13468</a> <span> [<a href="https://arxiv.org/pdf/2106.13468">pdf</a>, <a href="https://arxiv.org/format/2106.13468">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="High Energy Physics - Lattice">hep-lat</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevD.104.074503">10.1103/PhysRevD.104.074503 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Quark flavor decomposition of the nucleon axial form factors </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-lat?searchtype=author&query=Alexandrou%2C+C">C. Alexandrou</a>, <a href="/search/hep-lat?searchtype=author&query=Bacchio%2C+S">S. Bacchio</a>, <a href="/search/hep-lat?searchtype=author&query=Constantinou%2C+M">M. Constantinou</a>, <a href="/search/hep-lat?searchtype=author&query=Hadjiyiannakou%2C+K">K. Hadjiyiannakou</a>, <a href="/search/hep-lat?searchtype=author&query=Jansen%2C+K">K. Jansen</a>, <a href="/search/hep-lat?searchtype=author&query=Koutsou%2C+G">G. Koutsou</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2106.13468v1-abstract-short" style="display: inline;"> We present results on the isoscalar form factors including the disconnected contributions, as well as on the strange and charm quark form factors. Using previous results on the isovector form factors, we determine the flavor decomposition of the nucleon axial form factors. These are computed using an ensemble of $N_f=2+1+1$ twisted mass fermions simulated with physical values of quark masses. We i… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2106.13468v1-abstract-full').style.display = 'inline'; document.getElementById('2106.13468v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2106.13468v1-abstract-full" style="display: none;"> We present results on the isoscalar form factors including the disconnected contributions, as well as on the strange and charm quark form factors. Using previous results on the isovector form factors, we determine the flavor decomposition of the nucleon axial form factors. These are computed using an ensemble of $N_f=2+1+1$ twisted mass fermions simulated with physical values of quark masses. We investigate the SU(3) flavor symmetry and show that there is up to 10\% breaking for the axial and up to 50\% for the induced pseudoscalar form factors. By fitting the $Q^2$-dependence, we determined the corresponding root mean square radii. The pseudoscalar coupling of the $畏$ meson and the nucleon is found to be $g_{畏NN}=3.7(1.0)(0.7)$, and the Goldberger-Treiman discrepancy for the octet combination about 50\%. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2106.13468v1-abstract-full').style.display = 'none'; document.getElementById('2106.13468v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 25 June, 2021; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> June 2021. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. D 104, 074503 (2021) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2106.13027">arXiv:2106.13027</a> <span> [<a href="https://arxiv.org/pdf/2106.13027">pdf</a>, <a href="https://arxiv.org/format/2106.13027">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="High Energy Physics - Lattice">hep-lat</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Phenomenology">hep-ph</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevLett.128.062002">10.1103/PhysRevLett.128.062002 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Lattice QCD Study of Transverse-Momentum Dependent Soft Function </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-lat?searchtype=author&query=Li%2C+Y">Yuan Li</a>, <a href="/search/hep-lat?searchtype=author&query=Xia%2C+S">Shi-Cheng Xia</a>, <a href="/search/hep-lat?searchtype=author&query=Alexandrou%2C+C">Constantia Alexandrou</a>, <a href="/search/hep-lat?searchtype=author&query=Cichy%2C+K">Krzysztof Cichy</a>, <a href="/search/hep-lat?searchtype=author&query=Constantinou%2C+M">Martha Constantinou</a>, <a href="/search/hep-lat?searchtype=author&query=Feng%2C+X">Xu Feng</a>, <a href="/search/hep-lat?searchtype=author&query=Hadjiyiannakou%2C+K">Kyriakos Hadjiyiannakou</a>, <a href="/search/hep-lat?searchtype=author&query=Jansen%2C+K">Karl Jansen</a>, <a href="/search/hep-lat?searchtype=author&query=Liu%2C+C">Chuan Liu</a>, <a href="/search/hep-lat?searchtype=author&query=Scapellato%2C+A">Aurora Scapellato</a>, <a href="/search/hep-lat?searchtype=author&query=Steffens%2C+F">Fernanda Steffens</a>, <a href="/search/hep-lat?searchtype=author&query=Tarello%2C+J">Jacopo Tarello</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2106.13027v2-abstract-short" style="display: inline;"> In this work, we perform a lattice QCD study of the intrinsic, rapidity-independent soft function within the framework of large momentum effective theory. The computation is carried out using a gauge ensemble of $N_f=2+1+1$ clover-improved twisted mass fermion. After applying an appropriate renormalization procedure and the removal of significant higher-twist contamination, we obtain the intrinsic… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2106.13027v2-abstract-full').style.display = 'inline'; document.getElementById('2106.13027v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2106.13027v2-abstract-full" style="display: none;"> In this work, we perform a lattice QCD study of the intrinsic, rapidity-independent soft function within the framework of large momentum effective theory. The computation is carried out using a gauge ensemble of $N_f=2+1+1$ clover-improved twisted mass fermion. After applying an appropriate renormalization procedure and the removal of significant higher-twist contamination, we obtain the intrinsic soft function that is comparable to the one-loop perturbative result at large external momentum. The determination of the nonperturbative soft function from first principles is crucial to sharpen our understanding of the processes with small transverse momentum such as the Drell-Yan production and the semi-inclusive deep inelastic scattering. Additionally, we calculate the Collins-Soper evolution kernel using the quasi-transverse-momentum-dependent wave function as input. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2106.13027v2-abstract-full').style.display = 'none'; document.getElementById('2106.13027v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 1 February, 2022; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 24 June, 2021; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> June 2021. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">7 pages, 4 figures</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2104.13408">arXiv:2104.13408</a> <span> [<a href="https://arxiv.org/pdf/2104.13408">pdf</a>, <a href="https://arxiv.org/format/2104.13408">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="High Energy Physics - Lattice">hep-lat</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Phenomenology">hep-ph</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevD.104.074515">10.1103/PhysRevD.104.074515 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Quark masses using twisted mass fermion gauge ensembles </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-lat?searchtype=author&query=Alexandrou%2C+C">C. Alexandrou</a>, <a href="/search/hep-lat?searchtype=author&query=Bacchio%2C+S">S. Bacchio</a>, <a href="/search/hep-lat?searchtype=author&query=Bergner%2C+G">G. Bergner</a>, <a href="/search/hep-lat?searchtype=author&query=Constantinou%2C+M">M. Constantinou</a>, <a href="/search/hep-lat?searchtype=author&query=Di+Carlo%2C+M">M. Di Carlo</a>, <a href="/search/hep-lat?searchtype=author&query=Dimopoulos%2C+P">P. Dimopoulos</a>, <a href="/search/hep-lat?searchtype=author&query=Finkenrath%2C+J">J. Finkenrath</a>, <a href="/search/hep-lat?searchtype=author&query=Fiorenza%2C+E">E. Fiorenza</a>, <a href="/search/hep-lat?searchtype=author&query=Frezzotti%2C+R">R. Frezzotti</a>, <a href="/search/hep-lat?searchtype=author&query=Garofalo%2C+M">M. Garofalo</a>, <a href="/search/hep-lat?searchtype=author&query=Hadjiyiannakou%2C+K">K. Hadjiyiannakou</a>, <a href="/search/hep-lat?searchtype=author&query=Kostrzewa%2C+B">B. Kostrzewa</a>, <a href="/search/hep-lat?searchtype=author&query=Koutsou%2C+G">G. Koutsou</a>, <a href="/search/hep-lat?searchtype=author&query=Jansen%2C+K">K. Jansen</a>, <a href="/search/hep-lat?searchtype=author&query=Lubicz%2C+V">V. Lubicz</a>, <a href="/search/hep-lat?searchtype=author&query=Mangin-Brinet%2C+M">M. Mangin-Brinet</a>, <a href="/search/hep-lat?searchtype=author&query=Manigrasso%2C+F">F. Manigrasso</a>, <a href="/search/hep-lat?searchtype=author&query=Martinelli%2C+G">G. Martinelli</a>, <a href="/search/hep-lat?searchtype=author&query=Papadiofantous%2C+E">E. Papadiofantous</a>, <a href="/search/hep-lat?searchtype=author&query=Pittler%2C+F">F. Pittler</a>, <a href="/search/hep-lat?searchtype=author&query=Rossi%2C+G+C">G. C. Rossi</a>, <a href="/search/hep-lat?searchtype=author&query=Sanfilippo%2C+F">F. Sanfilippo</a>, <a href="/search/hep-lat?searchtype=author&query=Simula%2C+S">S. Simula</a>, <a href="/search/hep-lat?searchtype=author&query=Tarantino%2C+C">C. Tarantino</a>, <a href="/search/hep-lat?searchtype=author&query=Todaro%2C+A">A. Todaro</a> , et al. (2 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2104.13408v3-abstract-short" style="display: inline;"> We present a calculation of the up, down, strange and charm quark masses performed within the lattice QCD framework. We use the twisted mass fermion action and carry out simulations that include in the sea two light mass-degenerate quarks, as well as the strange and charm quarks. In the analysis we use gauge ensembles simulated at three values of the lattice spacing and with light quarks that corr… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2104.13408v3-abstract-full').style.display = 'inline'; document.getElementById('2104.13408v3-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2104.13408v3-abstract-full" style="display: none;"> We present a calculation of the up, down, strange and charm quark masses performed within the lattice QCD framework. We use the twisted mass fermion action and carry out simulations that include in the sea two light mass-degenerate quarks, as well as the strange and charm quarks. In the analysis we use gauge ensembles simulated at three values of the lattice spacing and with light quarks that correspond to pion masses in the range from 350 MeV to the physical value, while the strange and charm quark masses are tuned approximately to their physical values. We use several quantities to set the scale in order to check for finite lattice spacing effects and in the continuum limit we get compatible results. The quark mass renormalization is carried out non-perturbatively using the RI'-MOM method converted into the $\overline{\rm MS}$ scheme. For the determination of the quark masses we use physical observables from both the meson and the baryon sectors, obtaining $m_{ud} = 3.636(66)(^{+60}_{-57})$~MeV and $m_s = 98.7(2.4)(^{+4.0}_{-3.2})$~MeV in the $\overline{\rm MS}(2\,{\rm GeV})$ scheme and $m_c = 1036(17)(^{+15}_{-8})$~MeV in the $\overline{\rm MS}(3\,{\rm GeV})$ scheme, where the first errors are statistical and the second ones are combinations of systematic errors. For the quark mass ratios we get $m_s / m_{ud} = 27.17(32)(^{+56}_{-38})$ and $m_c / m_s = 11.48(12)(^{+25}_{-19})$. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2104.13408v3-abstract-full').style.display = 'none'; document.getElementById('2104.13408v3-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 11 October, 2021; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 27 April, 2021; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> April 2021. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">37 pages, 23 figures, 24 tables. One reference added</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2104.02247">arXiv:2104.02247</a> <span> [<a href="https://arxiv.org/pdf/2104.02247">pdf</a>, <a href="https://arxiv.org/format/2104.02247">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="High Energy Physics - Lattice">hep-lat</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Phenomenology">hep-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Theory">hep-th</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevD.104.054504">10.1103/PhysRevD.104.054504 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> The pion and kaon $\langle x^3 \rangle$ from lattice QCD and PDF reconstruction from Mellin moments </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-lat?searchtype=author&query=Alexandrou%2C+C">Constantia Alexandrou</a>, <a href="/search/hep-lat?searchtype=author&query=Bacchio%2C+S">Simone Bacchio</a>, <a href="/search/hep-lat?searchtype=author&query=Clo%C3%ABt%2C+I">Ian Clo毛t</a>, <a href="/search/hep-lat?searchtype=author&query=Constantinou%2C+M">Martha Constantinou</a>, <a href="/search/hep-lat?searchtype=author&query=Hadjiyiannakou%2C+K">Kyriakos Hadjiyiannakou</a>, <a href="/search/hep-lat?searchtype=author&query=Koutsou%2C+G">Giannis Koutsou</a>, <a href="/search/hep-lat?searchtype=author&query=Lauer%2C+C">Colin Lauer</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2104.02247v1-abstract-short" style="display: inline;"> We present a calculation of the pion and kaon Mellin moment $\langle x^3 \rangle$ extracted directly in lattice QCD using a three-derivative local operator. We use one ensemble of gauge configurations with two degenerate light, a strange and a charm quark ($N_f=2+1+1$) of maximally twisted mass fermions with clover improvement. The ensemble reproduces a pion mass $\sim260$ MeV, and a kaon mass… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2104.02247v1-abstract-full').style.display = 'inline'; document.getElementById('2104.02247v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2104.02247v1-abstract-full" style="display: none;"> We present a calculation of the pion and kaon Mellin moment $\langle x^3 \rangle$ extracted directly in lattice QCD using a three-derivative local operator. We use one ensemble of gauge configurations with two degenerate light, a strange and a charm quark ($N_f=2+1+1$) of maximally twisted mass fermions with clover improvement. The ensemble reproduces a pion mass $\sim260$ MeV, and a kaon mass $\sim530$ MeV. Excited-states contamination is evaluated using four values of the source-sink time separation within the range of $1.12-1.67$ fm. We use an operator that is free of mixing, and apply a multiplicative renormalization function calculated non-perturbatively. Our results are converted to the $\overline{\rm MS}$ scheme and evolved at a scale of 2 GeV, using three-loop expressions in perturbation theory. The final values are $\langle x^3 \rangle_蟺^{u^+}=0.024(18)_{\rm stat}(2)_{\rm syst}$, $\langle x^3 \rangle_K^{u^+}=0.035(6)_{\rm stat}(3)_{\rm syst}$, and $\langle x^3 \rangle_K^{s^+}=0.075(5)_{\rm stat}(1)_{\rm syst}$, where the systematic error is the uncertainty due to excited state contamination. We combine $\langle x^3 \rangle$ with the two lower moments to obtain the ratios $\langle x^3 \rangle/\langle x \rangle$ and $\langle x^3 \rangle/\langle x^2 \rangle$, as well as ratios between the pion and kaon moments. In addition, we reconstruct the $x$-dependence of the pion and kaon PDFs via 2- and 3-parameter fits to our results. We find that the reconstruction is feasible and that our lattice data favor a large $x$-dependence that falls as $(1-x)^2$ for both the pion and kaon PDFs. We integrate the reconstructed PDFs to extract the higher moments with $4\leq n\leq 6$. Finally, we compare the pion and kaon PDFs, as well as the ratios of their moments, to address the effect of SU(3) flavor symmetry breaking. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2104.02247v1-abstract-full').style.display = 'none'; document.getElementById('2104.02247v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 5 April, 2021; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> April 2021. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">24 pages, 12 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. D 104, 054504 (2021) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2011.13342">arXiv:2011.13342</a> <span> [<a href="https://arxiv.org/pdf/2011.13342">pdf</a>, <a href="https://arxiv.org/format/2011.13342">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="High Energy Physics - Lattice">hep-lat</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Phenomenology">hep-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Nuclear Theory">nucl-th</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevD.103.034509">10.1103/PhysRevD.103.034509 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Nucleon axial and pseudoscalar form factors from lattice QCD at the physical point </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-lat?searchtype=author&query=Alexandrou%2C+C">C. Alexandrou</a>, <a href="/search/hep-lat?searchtype=author&query=Bacchio%2C+S">S. Bacchio</a>, <a href="/search/hep-lat?searchtype=author&query=Constantinou%2C+M">M. Constantinou</a>, <a href="/search/hep-lat?searchtype=author&query=Dimopoulos%2C+P">P. Dimopoulos</a>, <a href="/search/hep-lat?searchtype=author&query=Finkenrath%2C+J">J. Finkenrath</a>, <a href="/search/hep-lat?searchtype=author&query=Hadjiyiannakou%2C+K">K. Hadjiyiannakou</a>, <a href="/search/hep-lat?searchtype=author&query=Jansen%2C+K">K. Jansen</a>, <a href="/search/hep-lat?searchtype=author&query=Koutsou%2C+G">G. Koutsou</a>, <a href="/search/hep-lat?searchtype=author&query=Kostrzewa%2C+B">B. Kostrzewa</a>, <a href="/search/hep-lat?searchtype=author&query=Leontiou%2C+T">T. Leontiou</a>, <a href="/search/hep-lat?searchtype=author&query=Urbach%2C+C">C. Urbach</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2011.13342v1-abstract-short" style="display: inline;"> We compute the nucleon axial and induced pseudoscalar form factors using three ensembles of gauge configurations, generated with dynamical light quarks with mass tuned to approximately their physical value. One of the ensembles also includes the strange and charm quarks with their mass close to physical. The latter ensemble has large statistics and finer lattice spacing and it is used to obtain fi… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2011.13342v1-abstract-full').style.display = 'inline'; document.getElementById('2011.13342v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2011.13342v1-abstract-full" style="display: none;"> We compute the nucleon axial and induced pseudoscalar form factors using three ensembles of gauge configurations, generated with dynamical light quarks with mass tuned to approximately their physical value. One of the ensembles also includes the strange and charm quarks with their mass close to physical. The latter ensemble has large statistics and finer lattice spacing and it is used to obtain final results, while the other two are used for assessing volume effects. The pseudoscalar form factor is also computed using these ensembles. We examine the momentum dependence of these form factors as well as relations based on pion pole dominance and the partially conserved axial-vector current hypothesis. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2011.13342v1-abstract-full').style.display = 'none'; document.getElementById('2011.13342v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 26 November, 2020; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> November 2020. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">25 pages and 27 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. D 103, 034509 (2021) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2011.01084">arXiv:2011.01084</a> <span> [<a href="https://arxiv.org/pdf/2011.01084">pdf</a>, <a href="https://arxiv.org/format/2011.01084">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="High Energy Physics - Lattice">hep-lat</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Phenomenology">hep-ph</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevD.103.054501">10.1103/PhysRevD.103.054501 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Neutron electric dipole moment using lattice QCD simulations at the physical point </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-lat?searchtype=author&query=Alexandrou%2C+C">C. Alexandrou</a>, <a href="/search/hep-lat?searchtype=author&query=Athenodorou%2C+A">A. Athenodorou</a>, <a href="/search/hep-lat?searchtype=author&query=Hadjiyiannakou%2C+K">K. Hadjiyiannakou</a>, <a href="/search/hep-lat?searchtype=author&query=Todaro%2C+A">A. Todaro</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2011.01084v1-abstract-short" style="display: inline;"> We extract the neutron electric dipole moment $\vert \vec{d}_N\vert$ within the lattice QCD formalism. We analyse one ensemble of $N_f=2+1+1$ twisted mass clover-improved fermions with lattice spacing of $a \simeq 0.08 \ {\rm fm}$ and physical values of the quark masses corresponding to a pion mass $m_蟺 \simeq 139 \ {\rm MeV}$. The neutron electric dipole moment is extracted by computing the $CP$-… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2011.01084v1-abstract-full').style.display = 'inline'; document.getElementById('2011.01084v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2011.01084v1-abstract-full" style="display: none;"> We extract the neutron electric dipole moment $\vert \vec{d}_N\vert$ within the lattice QCD formalism. We analyse one ensemble of $N_f=2+1+1$ twisted mass clover-improved fermions with lattice spacing of $a \simeq 0.08 \ {\rm fm}$ and physical values of the quark masses corresponding to a pion mass $m_蟺 \simeq 139 \ {\rm MeV}$. The neutron electric dipole moment is extracted by computing the $CP$-odd electromagnetic form factor $F_3(Q^2 \to 0)$ through small $胃$-expansion of the action. This approach requires the calculation of the topological charge for which we employ a fermionic definition by means of spectral projectors while we also provide a comparison with the gluonic definition accompanied by the gradient flow. We show that using the topological charge from spectral projectors leads to absolute errors that are more than two times smaller than those provided when the field theoretic definition is employed. We find a value of $\vert \vec{d}_N\vert = 0.0009(24) \ 胃\ e \cdot {\rm fm}$ when using the fermionic definition, which is statistically consistent with zero. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2011.01084v1-abstract-full').style.display = 'none'; document.getElementById('2011.01084v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 2 November, 2020; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> November 2020. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">23 pages and 10 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. D 103, 054501 (2021) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2011.00964">arXiv:2011.00964</a> <span> [<a href="https://arxiv.org/pdf/2011.00964">pdf</a>, <a href="https://arxiv.org/format/2011.00964">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="High Energy Physics - Lattice">hep-lat</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Phenomenology">hep-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Nuclear Theory">nucl-th</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevD.103.094512">10.1103/PhysRevD.103.094512 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Lattice continuum-limit study of nucleon quasi-PDFs </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-lat?searchtype=author&query=Alexandrou%2C+C">Constantia Alexandrou</a>, <a href="/search/hep-lat?searchtype=author&query=Cichy%2C+K">Krzysztof Cichy</a>, <a href="/search/hep-lat?searchtype=author&query=Constantinou%2C+M">Martha Constantinou</a>, <a href="/search/hep-lat?searchtype=author&query=Green%2C+J+R">Jeremy R. Green</a>, <a href="/search/hep-lat?searchtype=author&query=Hadjiyiannakou%2C+K">Kyriakos Hadjiyiannakou</a>, <a href="/search/hep-lat?searchtype=author&query=Jansen%2C+K">Karl Jansen</a>, <a href="/search/hep-lat?searchtype=author&query=Manigrasso%2C+F">Floriano Manigrasso</a>, <a href="/search/hep-lat?searchtype=author&query=Scapellato%2C+A">Aurora Scapellato</a>, <a href="/search/hep-lat?searchtype=author&query=Steffens%2C+F">Fernanda Steffens</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2011.00964v3-abstract-short" style="display: inline;"> The quasi-PDF approach provides a path to computing parton distribution functions (PDFs) using lattice QCD. This approach requires matrix elements of a power-divergent operator in a nucleon at high momentum and one generically expects discretization effects starting at first order in the lattice spacing $a$. Therefore, it is important to demonstrate that the continuum limit can be reliably taken a… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2011.00964v3-abstract-full').style.display = 'inline'; document.getElementById('2011.00964v3-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2011.00964v3-abstract-full" style="display: none;"> The quasi-PDF approach provides a path to computing parton distribution functions (PDFs) using lattice QCD. This approach requires matrix elements of a power-divergent operator in a nucleon at high momentum and one generically expects discretization effects starting at first order in the lattice spacing $a$. Therefore, it is important to demonstrate that the continuum limit can be reliably taken and to understand the size and shape of lattice artifacts. In this work, we report a calculation of isovector unpolarized and helicity PDFs using lattice ensembles with $N_f=2+1+1$ Wilson twisted mass fermions, a pion mass of approximately 370 MeV, and three different lattice spacings. Our results show a significant dependence on $a$, and the continuum extrapolation produces a better agreement with phenomenology. The latter is particularly true for the antiquark distribution at small momentum fraction $x$, where the extrapolation changes its sign. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2011.00964v3-abstract-full').style.display = 'none'; document.getElementById('2011.00964v3-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 13 April, 2021; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 2 November, 2020; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> November 2020. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">24 pages, 21 figures. v2: additional references, discussion of systematics, and position-space comparison with phenomenology. v3: applied workaround for problem affecting Greek symbols in figures with some PDF viewers</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Report number:</span> CERN-TH-2020-181 </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. D 103, 094512 (2021) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2010.03495">arXiv:2010.03495</a> <span> [<a href="https://arxiv.org/pdf/2010.03495">pdf</a>, <a href="https://arxiv.org/format/2010.03495">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="High Energy Physics - Lattice">hep-lat</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Phenomenology">hep-ph</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevD.103.014508">10.1103/PhysRevD.103.014508 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> The Mellin moments $\langle x \rangle$ and $\langle x^2 \rangle$ for the pion and kaon from lattice QCD </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-lat?searchtype=author&query=Alexandrou%2C+C">Constantia Alexandrou</a>, <a href="/search/hep-lat?searchtype=author&query=Bacchio%2C+S">Simone Bacchio</a>, <a href="/search/hep-lat?searchtype=author&query=Cloet%2C+I">Ian Cloet</a>, <a href="/search/hep-lat?searchtype=author&query=Constantinou%2C+M">Martha Constantinou</a>, <a href="/search/hep-lat?searchtype=author&query=Hadjiyiannakou%2C+K">Kyriakos Hadjiyiannakou</a>, <a href="/search/hep-lat?searchtype=author&query=Koutsou%2C+G">Giannis Koutsou</a>, <a href="/search/hep-lat?searchtype=author&query=Lauer%2C+C">Colin Lauer</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2010.03495v2-abstract-short" style="display: inline;"> We present a calculation of the pion quark momentum fraction, $\langle x \rangle$, and its third Mellin moment $\langle x^2 \rangle$. We also obtain directly, for the first time, $\langle x \rangle$ and $\langle x^2 \rangle$ for the kaon using local operators. We use an ensemble of two degenerate light, a strange and a charm quark ($N_f=2+1+1$) of maximally twisted mass fermions with clover improv… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2010.03495v2-abstract-full').style.display = 'inline'; document.getElementById('2010.03495v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2010.03495v2-abstract-full" style="display: none;"> We present a calculation of the pion quark momentum fraction, $\langle x \rangle$, and its third Mellin moment $\langle x^2 \rangle$. We also obtain directly, for the first time, $\langle x \rangle$ and $\langle x^2 \rangle$ for the kaon using local operators. We use an ensemble of two degenerate light, a strange and a charm quark ($N_f=2+1+1$) of maximally twisted mass fermions with clover improvement. The quark masses are chosen so that they reproduce a pion mass of about 260 MeV, and a kaon mass of 530 MeV. The lattice spacing of the ensemble is 0.093 fm and the lattice has a spatial extent of 3 fm. We analyze several values of the source-sink time separation within the range of $1.12-2.23$ fm to study and eliminate excited-states contributions. The necessary renormalization functions are calculated non-perturbatively in the RI$'$ scheme, and are converted to the $\overline{\rm MS}$ scheme at a scale of 2 GeV. The final values for the momentum fraction are $\langle x \rangle^蟺_{u^+}=0.261(3)_{\rm stat}(6)_{\rm syst}$, $\langle x \rangle^K_{u^+}=0.246(2)_{\rm stat}(2)_{\rm syst}$, and $\langle x \rangle^K_{s^+}=0.317(2)_{\rm stat}(1)_{\rm syst}$. For the third Mellin moments we find $\langle x^2 \rangle^蟺_{u^+}=0.082(21)_{\rm stat}(17)_{\rm syst}$, $\langle x^2 \rangle^K_{u^+}=0.093(5)_{\rm stat}(3)_{\rm syst}$, and $\langle x^2 \rangle^K_{s^+}=0.134(5)_{\rm stat}(2)_{\rm syst}$. The reported systematic uncertainties are due to excited-state contamination. We also give the ratio $\langle x^2 \rangle/\langle x \rangle$ which is an indication of how quickly the PDFs lose support at large $x$. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2010.03495v2-abstract-full').style.display = 'none'; document.getElementById('2010.03495v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 8 January, 2021; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 7 October, 2020; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> October 2020. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">21 pages, 10 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. D 103, 014508 (2021) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2009.13061">arXiv:2009.13061</a> <span> [<a href="https://arxiv.org/pdf/2009.13061">pdf</a>, <a href="https://arxiv.org/format/2009.13061">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="High Energy Physics - Lattice">hep-lat</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Phenomenology">hep-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Nuclear Theory">nucl-th</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevLett.126.102003">10.1103/PhysRevLett.126.102003 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Flavor decomposition for the proton helicity parton distribution functions </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-lat?searchtype=author&query=Alexandrou%2C+C">C. Alexandrou</a>, <a href="/search/hep-lat?searchtype=author&query=Constantinou%2C+M">M. Constantinou</a>, <a href="/search/hep-lat?searchtype=author&query=Hadjiyiannakou%2C+K">K. Hadjiyiannakou</a>, <a href="/search/hep-lat?searchtype=author&query=Jansen%2C+K">K. Jansen</a>, <a href="/search/hep-lat?searchtype=author&query=Manigrasso%2C+F">F. Manigrasso</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2009.13061v1-abstract-short" style="display: inline;"> We present, for the first time, an \textit{ab initio} calculation of the individual up, down and strange quark helicity parton distribution functions for the proton. The calculation is performed within the twisted mass clover-improved fermion formulation of lattice QCD using one ensemble of dynamical up, down, strange and charm quarks with a pion mass of 260 MeV. The lattice matrix elements are no… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2009.13061v1-abstract-full').style.display = 'inline'; document.getElementById('2009.13061v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2009.13061v1-abstract-full" style="display: none;"> We present, for the first time, an \textit{ab initio} calculation of the individual up, down and strange quark helicity parton distribution functions for the proton. The calculation is performed within the twisted mass clover-improved fermion formulation of lattice QCD using one ensemble of dynamical up, down, strange and charm quarks with a pion mass of 260 MeV. The lattice matrix elements are non-perturbatively renormalized and the final results are presented in the $\overline{ \rm MS}$ scheme at a scale of 2 GeV. We give results on the $螖u^+(x)$ and $螖d^+(x)$, including disconnected quark loop contributions, as well as on the $螖s^+(x)$. For the latter we achieve unprecedented precision compared to the phenomenological estimates. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2009.13061v1-abstract-full').style.display = 'none'; document.getElementById('2009.13061v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 28 September, 2020; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> September 2020. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">6 pages, 3 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. Lett. 126, 102003 (2021) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2008.10573">arXiv:2008.10573</a> <span> [<a href="https://arxiv.org/pdf/2008.10573">pdf</a>, <a href="https://arxiv.org/format/2008.10573">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="High Energy Physics - Lattice">hep-lat</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Phenomenology">hep-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Theory">hep-th</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevLett.125.262001">10.1103/PhysRevLett.125.262001 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Unpolarized and helicity generalized parton distributions of the proton within lattice QCD </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-lat?searchtype=author&query=Alexandrou%2C+C">Constantia Alexandrou</a>, <a href="/search/hep-lat?searchtype=author&query=Cichy%2C+K">Krzysztof Cichy</a>, <a href="/search/hep-lat?searchtype=author&query=Constantinou%2C+M">Martha Constantinou</a>, <a href="/search/hep-lat?searchtype=author&query=Hadjiyiannakou%2C+K">Kyriakos Hadjiyiannakou</a>, <a href="/search/hep-lat?searchtype=author&query=Jansen%2C+K">Karl Jansen</a>, <a href="/search/hep-lat?searchtype=author&query=Scapellato%2C+A">Aurora Scapellato</a>, <a href="/search/hep-lat?searchtype=author&query=Steffens%2C+F">Fernanda Steffens</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2008.10573v2-abstract-short" style="display: inline;"> We present the first calculation of the $x$-dependence of the proton generalized parton distributions (GPDs) within lattice QCD. Results are obtained for the isovector unpolarized and helicity GPDs. We compute the appropriate matrix elements of fast-moving protons coupled to non-local operators containing a Wilson line. We present results for proton momenta $0.83,\,1.25,\,1.67$ GeV, and momentum t… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2008.10573v2-abstract-full').style.display = 'inline'; document.getElementById('2008.10573v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2008.10573v2-abstract-full" style="display: none;"> We present the first calculation of the $x$-dependence of the proton generalized parton distributions (GPDs) within lattice QCD. Results are obtained for the isovector unpolarized and helicity GPDs. We compute the appropriate matrix elements of fast-moving protons coupled to non-local operators containing a Wilson line. We present results for proton momenta $0.83,\,1.25,\,1.67$ GeV, and momentum transfer squared $0.69,\,1.38$ GeV$^2$. These combinations include cases with zero and nonzero skewness. The calculation is performed using one ensemble of two degenerate mass light, a strange and a charm quark of maximally twisted mass fermions with a clover term. The lattice results are matched to the light-cone GPDs using one-loop perturbation theory within the framework of large momentum effective theory. The final GPDs are given in the $\overline{\rm MS}$ scheme at a scale of 2 GeV. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2008.10573v2-abstract-full').style.display = 'none'; document.getElementById('2008.10573v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 23 November, 2020; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 24 August, 2020; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> August 2020. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">Main document: 5 pages, Supplementary document (Appendix): 10 pages. Version accepted for publication in Physical Review Letters</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. Lett. 125, 262001 (2020) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2003.08486">arXiv:2003.08486</a> <span> [<a href="https://arxiv.org/pdf/2003.08486">pdf</a>, <a href="https://arxiv.org/format/2003.08486">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="High Energy Physics - Lattice">hep-lat</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Phenomenology">hep-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Nuclear Theory">nucl-th</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevD.101.094513">10.1103/PhysRevD.101.094513 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Complete flavor decomposition of the spin and momentum fraction of the proton using lattice QCD simulations at physical pion mass </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-lat?searchtype=author&query=Alexandrou%2C+C">C. Alexandrou</a>, <a href="/search/hep-lat?searchtype=author&query=Bacchio%2C+S">S. Bacchio</a>, <a href="/search/hep-lat?searchtype=author&query=Constantinou%2C+M">M. Constantinou</a>, <a href="/search/hep-lat?searchtype=author&query=Finkenrath%2C+J">J. Finkenrath</a>, <a href="/search/hep-lat?searchtype=author&query=Hadjiyiannakou%2C+K">K. Hadjiyiannakou</a>, <a href="/search/hep-lat?searchtype=author&query=Jansen%2C+K">K. Jansen</a>, <a href="/search/hep-lat?searchtype=author&query=Koutsou%2C+G">G. Koutsou</a>, <a href="/search/hep-lat?searchtype=author&query=Panagopoulos%2C+H">H. Panagopoulos</a>, <a href="/search/hep-lat?searchtype=author&query=Spanoudes%2C+G">G. Spanoudes</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2003.08486v1-abstract-short" style="display: inline;"> We evaluate the gluon and quark contributions to the spin of the proton using an ensemble of gauge configuration generated at physical pion mass. We compute all valence and sea quark contributions to high accuracy. We perform a non-perturbative renormalization for both quark and gluon matrix elements. We find that the contribution of the up, down, strange and charm quarks to the proton intrinsic s… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2003.08486v1-abstract-full').style.display = 'inline'; document.getElementById('2003.08486v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2003.08486v1-abstract-full" style="display: none;"> We evaluate the gluon and quark contributions to the spin of the proton using an ensemble of gauge configuration generated at physical pion mass. We compute all valence and sea quark contributions to high accuracy. We perform a non-perturbative renormalization for both quark and gluon matrix elements. We find that the contribution of the up, down, strange and charm quarks to the proton intrinsic spin is $\frac{1}{2}\sum_{q=u,d,s,c}螖危^{q^+}=0.191(15)$ and to the total spin $\sum_{q=u,d,s,c}J^{q^+}=0.285(45)$. The gluon contribution to the spin is $J^g=0.187(46)$ yielding $J=J^q+J^g=0.473(71)$ confirming the spin sum. The momentum fraction carried by quarks in the proton is found to be $0.618(60)$ and by gluons $0.427(92)$, the sum of which gives $1.045(118)$ confirming the momentum sum rule. All scale and scheme dependent quantities are given in the $\mathrm{ \overline{MS}}$ scheme at 2 GeV. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2003.08486v1-abstract-full').style.display = 'none'; document.getElementById('2003.08486v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 18 March, 2020; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> March 2020. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2002.12044">arXiv:2002.12044</a> <span> [<a href="https://arxiv.org/pdf/2002.12044">pdf</a>, <a href="https://arxiv.org/format/2002.12044">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="High Energy Physics - Lattice">hep-lat</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Phenomenology">hep-ph</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevD.102.014508">10.1103/PhysRevD.102.014508 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Parton distribution functions of $螖^+$ on the lattice </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-lat?searchtype=author&query=Chai%2C+Y">Yahui Chai</a>, <a href="/search/hep-lat?searchtype=author&query=Li%2C+Y">Yuan Li</a>, <a href="/search/hep-lat?searchtype=author&query=Xia%2C+S">Shicheng Xia</a>, <a href="/search/hep-lat?searchtype=author&query=Alexandrou%2C+C">Constantia Alexandrou</a>, <a href="/search/hep-lat?searchtype=author&query=Cichy%2C+K">Krzysztof Cichy</a>, <a href="/search/hep-lat?searchtype=author&query=Constantinou%2C+M">Martha Constantinou</a>, <a href="/search/hep-lat?searchtype=author&query=Feng%2C+X">Xu Feng</a>, <a href="/search/hep-lat?searchtype=author&query=Hadjiyiannakou%2C+K">Kyriakos Hadjiyiannakou</a>, <a href="/search/hep-lat?searchtype=author&query=Jansen%2C+K">Karl Jansen</a>, <a href="/search/hep-lat?searchtype=author&query=Koutsou%2C+G">Giannis Koutsou</a>, <a href="/search/hep-lat?searchtype=author&query=Liu%2C+C">Chuan Liu</a>, <a href="/search/hep-lat?searchtype=author&query=Scapellato%2C+A">Aurora Scapellato</a>, <a href="/search/hep-lat?searchtype=author&query=Steffens%2C+F">Fernanda Steffens</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2002.12044v2-abstract-short" style="display: inline;"> We perform a first calculation for the unpolarized parton distribution function of the $螖^+$ baryon using lattice QCD simulations within the framework of Large Momentum Effective Theory. Two ensembles of $N_f=2+1+1$ twisted mass fermions are utilized with a pion mass of 270 MeV and 360 MeV, respectively. The baryon, which is treated as a stable single-particle state, is boosted with momentum… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2002.12044v2-abstract-full').style.display = 'inline'; document.getElementById('2002.12044v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2002.12044v2-abstract-full" style="display: none;"> We perform a first calculation for the unpolarized parton distribution function of the $螖^+$ baryon using lattice QCD simulations within the framework of Large Momentum Effective Theory. Two ensembles of $N_f=2+1+1$ twisted mass fermions are utilized with a pion mass of 270 MeV and 360 MeV, respectively. The baryon, which is treated as a stable single-particle state, is boosted with momentum $P_3$ with values $\{0.42,0.83,1.25\}$ GeV, and we utilize momentum smearing to improve the signal. The unpolarized parton distribution function of $螖^+$ is obtained using a non-perturbative renormalization and a one-loop formula for the matching, with encouraging precision. In particular, we compute the $\overline{d}(x)-\overline{u}(x)$ asymmetry and compare it with the same quantity in the nucleon, in a first attempt towards resolving the physical mechanism responsible for generating such asymmetry. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2002.12044v2-abstract-full').style.display = 'none'; document.getElementById('2002.12044v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 17 July, 2020; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 27 February, 2020; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> February 2020. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. D 102, 014508 (2020) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2002.06984">arXiv:2002.06984</a> <span> [<a href="https://arxiv.org/pdf/2002.06984">pdf</a>, <a href="https://arxiv.org/format/2002.06984">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="High Energy Physics - Lattice">hep-lat</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Phenomenology">hep-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Nuclear Theory">nucl-th</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevD.101.114504">10.1103/PhysRevD.101.114504 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Model-independent determination of the nucleon charge radius from lattice QCD </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-lat?searchtype=author&query=Alexandrou%2C+C">Constantia Alexandrou</a>, <a href="/search/hep-lat?searchtype=author&query=Hadjiyiannakou%2C+K">Kyriakos Hadjiyiannakou</a>, <a href="/search/hep-lat?searchtype=author&query=Koutsou%2C+G">Giannis Koutsou</a>, <a href="/search/hep-lat?searchtype=author&query=Ottnad%2C+K">Konstantin Ottnad</a>, <a href="/search/hep-lat?searchtype=author&query=Petschlies%2C+M">Marcus Petschlies</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2002.06984v2-abstract-short" style="display: inline;"> Lattice QCD calculations of nucleon form factors are restricted to discrete values of the Euclidean four-momentum transfer. Therefore, the extraction of radii typically relies on parametrizing and fitting the lattice QCD data to obtain its slope close to zero momentum transfer. We investigate a new method, which allows to compute the nucleon radius directly from existing lattice QCD data, without… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2002.06984v2-abstract-full').style.display = 'inline'; document.getElementById('2002.06984v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2002.06984v2-abstract-full" style="display: none;"> Lattice QCD calculations of nucleon form factors are restricted to discrete values of the Euclidean four-momentum transfer. Therefore, the extraction of radii typically relies on parametrizing and fitting the lattice QCD data to obtain its slope close to zero momentum transfer. We investigate a new method, which allows to compute the nucleon radius directly from existing lattice QCD data, without assuming a functional form for the momentum dependence of the underlying form factor. The method is illustrated for the case of the isovector mean square charge radius of the nucleon $\langle r^2_\mathrm{isov} \rangle$ and the quark-connected contributions to $\langle r^2_p\rangle$ and $\langle r^2_n \rangle$ for the proton and neutron, respectively. Computations are performed using a single gauge ensemble with $N_f=2+1+1$ maximally twisted mass clover-improved fermions at physical quark mass and a lattice spacing of $a=0.08\mathrm{fm}$. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2002.06984v2-abstract-full').style.display = 'none'; document.getElementById('2002.06984v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 24 June, 2020; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 17 February, 2020; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> February 2020. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">19 pages, 9 figures and 2 tables, matching version accepted for publication in PRD</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. D 101, 114504 (2020) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1910.13229">arXiv:1910.13229</a> <span> [<a href="https://arxiv.org/pdf/1910.13229">pdf</a>, <a href="https://arxiv.org/format/1910.13229">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="High Energy Physics - Lattice">hep-lat</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Phenomenology">hep-ph</span> </div> </div> <p class="title is-5 mathjax"> Quasi-PDFs with twisted mass fermions </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-lat?searchtype=author&query=Alexandrou%2C+C">Constantia Alexandrou</a>, <a href="/search/hep-lat?searchtype=author&query=Cichy%2C+K">Krzysztof Cichy</a>, <a href="/search/hep-lat?searchtype=author&query=Constantinou%2C+M">Martha Constantinou</a>, <a href="/search/hep-lat?searchtype=author&query=Hadjiyiannakou%2C+K">Kyriakos Hadjiyiannakou</a>, <a href="/search/hep-lat?searchtype=author&query=Jansen%2C+K">Karl Jansen</a>, <a href="/search/hep-lat?searchtype=author&query=Scapellato%2C+A">Aurora Scapellato</a>, <a href="/search/hep-lat?searchtype=author&query=Steffens%2C+F">Fernanda Steffens</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1910.13229v2-abstract-short" style="display: inline;"> We discuss the recent progress in extracting partonic functions from the quasi-distribution approach, using twisted mass fermions. This concerns, among others, the investigation of several sources of systematic effects. Their careful analysis is a prerequisite to obtain precise determinations of PDFs from the lattice with realistic estimates of all uncertainties. In these proceedings, we shortly d… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1910.13229v2-abstract-full').style.display = 'inline'; document.getElementById('1910.13229v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1910.13229v2-abstract-full" style="display: none;"> We discuss the recent progress in extracting partonic functions from the quasi-distribution approach, using twisted mass fermions. This concerns, among others, the investigation of several sources of systematic effects. Their careful analysis is a prerequisite to obtain precise determinations of PDFs from the lattice with realistic estimates of all uncertainties. In these proceedings, we shortly discuss systematic effects in the matching procedure. Moreover, we present preliminary results from our new simulations at the physical point. They involve, additionally, the dynamical strange and charm quarks, as well as a larger volume and a smaller lattice spacing than in our previous computations. In addition, we show first results from computations of generalized parton distributions (GPDs) in the quasi-distribution framework. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1910.13229v2-abstract-full').style.display = 'none'; document.getElementById('1910.13229v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 21 November, 2019; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 29 October, 2019; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> October 2019. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">7 pages, 4 figures, proceedings of the 37th International Symposium on Lattice Field Theory - Lattice2019, Wuhan; v2 - references updated</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1909.10744">arXiv:1909.10744</a> <span> [<a href="https://arxiv.org/pdf/1909.10744">pdf</a>, <a href="https://arxiv.org/format/1909.10744">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="High Energy Physics - Lattice">hep-lat</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Phenomenology">hep-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Nuclear Theory">nucl-th</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevD.101.031501">10.1103/PhysRevD.101.031501 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Nucleon strange electromagnetic form factors </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-lat?searchtype=author&query=Alexandrou%2C+C">C. Alexandrou</a>, <a href="/search/hep-lat?searchtype=author&query=Bacchio%2C+S">S. Bacchio</a>, <a href="/search/hep-lat?searchtype=author&query=Constantinou%2C+M">M. Constantinou</a>, <a href="/search/hep-lat?searchtype=author&query=Finkenrath%2C+J">J. Finkenrath</a>, <a href="/search/hep-lat?searchtype=author&query=Hadjiyiannakou%2C+K">K. Hadjiyiannakou</a>, <a href="/search/hep-lat?searchtype=author&query=Jansen%2C+K">K. Jansen</a>, <a href="/search/hep-lat?searchtype=author&query=Koutsou%2C+G">G. Koutsou</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1909.10744v1-abstract-short" style="display: inline;"> The role of the strange quarks on the low-energy interactions of the proton can be probed through the strange electromagnetic form factors. Knowledge of these form factors provides essential input for parity-violating processes and contributes to the understanding of the sea quark dynamics. We determine the strange electromagnetic form factors of the nucleon within the lattice formulation of Quant… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1909.10744v1-abstract-full').style.display = 'inline'; document.getElementById('1909.10744v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1909.10744v1-abstract-full" style="display: none;"> The role of the strange quarks on the low-energy interactions of the proton can be probed through the strange electromagnetic form factors. Knowledge of these form factors provides essential input for parity-violating processes and contributes to the understanding of the sea quark dynamics. We determine the strange electromagnetic form factors of the nucleon within the lattice formulation of Quantum Chromodynamics using simulations that include light, strange and charm quarks in the sea all tuned to their physical mass values. We employ state-of-the-art techniques to accurately extract the form factors for values of the momentum transfer square up to 0.8~GeV$^2$. We find that both the electric and magnetic form factors are statistically non-zero. We obtain for the strange magnetic moment $渭^s=-0.017(4)$, the strange magnetic radius $\langle r^2_M \rangle^s=-0.015(9)$~fm$^2$, and the strange charge radius $\langle r^2_E \rangle^s=-0.0048(6)$~fm$^2$. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1909.10744v1-abstract-full').style.display = 'none'; document.getElementById('1909.10744v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 24 September, 2019; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> September 2019. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">7 pages and 5 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. D 101, 031501 (2020) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1909.00485">arXiv:1909.00485</a> <span> [<a href="https://arxiv.org/pdf/1909.00485">pdf</a>, <a href="https://arxiv.org/format/1909.00485">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="High Energy Physics - Lattice">hep-lat</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Phenomenology">hep-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Nuclear Theory">nucl-th</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevD.102.054517">10.1103/PhysRevD.102.054517 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Nucleon axial, tensor and scalar charges and $蟽$-terms in lattice QCD </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-lat?searchtype=author&query=Alexandrou%2C+C">C. Alexandrou</a>, <a href="/search/hep-lat?searchtype=author&query=Bacchio%2C+S">S. Bacchio</a>, <a href="/search/hep-lat?searchtype=author&query=Constantinou%2C+M">M. Constantinou</a>, <a href="/search/hep-lat?searchtype=author&query=Hadjiyiannakou%2C+K">K. Hadjiyiannakou</a>, <a href="/search/hep-lat?searchtype=author&query=Jansen%2C+K">K. Jansen</a>, <a href="/search/hep-lat?searchtype=author&query=Koutsou%2C+G">G. Koutsou</a>, <a href="/search/hep-lat?searchtype=author&query=Aviles-Casco%2C+A+V">A. Vaquero Aviles-Casco</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1909.00485v2-abstract-short" style="display: inline;"> We determine the nucleon axial, scalar and tensor charges within lattice Quantum Chromodynamics including all contributions from valence and sea quarks. We analyze three gauge ensembles simulated within the twisted mass formulation at approximately physical value of the pion mass. Two of these ensembles are simulated with two dynamical light quarks and lattice spacing $a=0.094$~fm and the third… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1909.00485v2-abstract-full').style.display = 'inline'; document.getElementById('1909.00485v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1909.00485v2-abstract-full" style="display: none;"> We determine the nucleon axial, scalar and tensor charges within lattice Quantum Chromodynamics including all contributions from valence and sea quarks. We analyze three gauge ensembles simulated within the twisted mass formulation at approximately physical value of the pion mass. Two of these ensembles are simulated with two dynamical light quarks and lattice spacing $a=0.094$~fm and the third with $a=0.08$~fm includes in addition the strange and charm quarks in the sea. After comparing the results among these three ensembles, we quote as final values our most accurate analysis using the latter ensemble. For the nucleon isovector axial charge we find $1.286(23)$ in agreement with the experimental value. We provide the flavor decomposition of the intrinsic spin $\frac{1}{2}螖危^q$ carried by quarks in the nucleon obtaining for the up, down, strange and charm quarks $\frac{1}{2}螖危^{u}=0.431(8)$, $\frac{1}{2}螖危^{d}=-0.212(8)$, $\frac{1}{2}螖危^{s}=-0.023(4)$ and $\frac{1}{2}螖危^{c}=-0.005(2)$, respectively. The corresponding values of the tensor and scalar charges for each quark flavor are also evaluated providing valuable input for experimental searches for beyond the standard model physics. In addition, we extract the nucleon $蟽$-terms and find for the light quark content $蟽_{蟺N}=41.6(3.8)$~MeV and for the strange $蟽_{s}=45.6(6.2)$~MeV. The y-parameter that is used in phenomenological studies we find $y=0.078(7)$. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1909.00485v2-abstract-full').style.display = 'none'; document.getElementById('1909.00485v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 1 October, 2020; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 1 September, 2019; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> September 2019. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">Expanded version as accepted in Phys. Rev. D.20 pages and 20 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. D 102, 054517 (2020) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1908.10706">arXiv:1908.10706</a> <span> [<a href="https://arxiv.org/pdf/1908.10706">pdf</a>, <a href="https://arxiv.org/format/1908.10706">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="High Energy Physics - Lattice">hep-lat</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Phenomenology">hep-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Nuclear Theory">nucl-th</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevD.101.034519">10.1103/PhysRevD.101.034519 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Moments of nucleon generalized parton distributions from lattice QCD simulations at physical pion mass </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-lat?searchtype=author&query=Alexandrou%2C+C">C. Alexandrou</a>, <a href="/search/hep-lat?searchtype=author&query=Bacchio%2C+S">S. Bacchio</a>, <a href="/search/hep-lat?searchtype=author&query=Constantinou%2C+M">M. Constantinou</a>, <a href="/search/hep-lat?searchtype=author&query=Dimopoulos%2C+P">P. Dimopoulos</a>, <a href="/search/hep-lat?searchtype=author&query=Finkenrath%2C+J">J. Finkenrath</a>, <a href="/search/hep-lat?searchtype=author&query=Frezzotti%2C+R">R. Frezzotti</a>, <a href="/search/hep-lat?searchtype=author&query=Hadjiyiannakou%2C+K">K. Hadjiyiannakou</a>, <a href="/search/hep-lat?searchtype=author&query=Jansen%2C+K">K. Jansen</a>, <a href="/search/hep-lat?searchtype=author&query=Kostrzewa%2C+B">B. Kostrzewa</a>, <a href="/search/hep-lat?searchtype=author&query=Koutsou%2C+G">G. Koutsou</a>, <a href="/search/hep-lat?searchtype=author&query=Lauer%2C+C">C. Lauer</a>, <a href="/search/hep-lat?searchtype=author&query=Urbach%2C+C">C. Urbach</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1908.10706v3-abstract-short" style="display: inline;"> We present results for the moments of nucleon isovector vector and axial generalised parton distribution functions computed within lattice QCD. Three ensembles of maximally twisted mass clover-improved fermions simulated with a physical value of the pion mass are analyzed. Two of these ensembles are generated using two degenerate light quarks. A third ensemble is used having, in addition to the li… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1908.10706v3-abstract-full').style.display = 'inline'; document.getElementById('1908.10706v3-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1908.10706v3-abstract-full" style="display: none;"> We present results for the moments of nucleon isovector vector and axial generalised parton distribution functions computed within lattice QCD. Three ensembles of maximally twisted mass clover-improved fermions simulated with a physical value of the pion mass are analyzed. Two of these ensembles are generated using two degenerate light quarks. A third ensemble is used having, in addition to the light quarks, strange and charm quarks in the sea. A careful analysis of the convergence to the ground state is carried out that is shown to be essential for extracting the correct nucleon matrix elements. This allows a controlled determination of the unpolarised, helicity and tensor second Mellin moments. The vector and axial-vector generalised form factors are also computed as a function of the momentum transfer square up to about 1 GeV$^2$. The three ensembles allow us to check for unquenching effects and to assess lattice finite volume effects. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1908.10706v3-abstract-full').style.display = 'none'; document.getElementById('1908.10706v3-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 2 March, 2020; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 28 August, 2019; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> August 2019. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">Published version. Typos corrected, references and figures added. 22 pages, 17 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. D 101, 034519 (2020) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1907.09827">arXiv:1907.09827</a> <span> [<a href="https://arxiv.org/pdf/1907.09827">pdf</a>, <a href="https://arxiv.org/format/1907.09827">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="High Energy Physics - Lattice">hep-lat</span> </div> </div> <p class="title is-5 mathjax"> Parton distribution functions of $螖^+$ on the lattice </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-lat?searchtype=author&query=Chai%2C+Y">Yahui Chai</a>, <a href="/search/hep-lat?searchtype=author&query=Li%2C+Y">Yuan Li</a>, <a href="/search/hep-lat?searchtype=author&query=Xia%2C+S">Shicheng Xia</a>, <a href="/search/hep-lat?searchtype=author&query=Alexandrou%2C+C">Constantia Alexandrou</a>, <a href="/search/hep-lat?searchtype=author&query=Cichy%2C+K">Krzysztof Cichy</a>, <a href="/search/hep-lat?searchtype=author&query=Constantinou%2C+M">Martha Constantinou</a>, <a href="/search/hep-lat?searchtype=author&query=Feng%2C+X">Xu Feng</a>, <a href="/search/hep-lat?searchtype=author&query=Hadjiyiannakou%2C+K">Kyriakos Hadjiyiannakou</a>, <a href="/search/hep-lat?searchtype=author&query=Jansen%2C+K">Karl Jansen</a>, <a href="/search/hep-lat?searchtype=author&query=Koutsou%2C+G">Giannis Koutsou</a>, <a href="/search/hep-lat?searchtype=author&query=Liu%2C+C">Chuan Liu</a>, <a href="/search/hep-lat?searchtype=author&query=Scapellato%2C+A">Aurora Scapellato</a>, <a href="/search/hep-lat?searchtype=author&query=Steffens%2C+F">Fernanda Steffens</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1907.09827v1-abstract-short" style="display: inline;"> We present results for renormalized matrix elements related to the unpolarized quasi-distribution function of the $螖^+$ baryon making use of the large momentum effective theory. Two ensembles of $N_f=2+1+1$ twisted mass fermions with a clover term and pion masses of 250 MeV and 330 MeV are analyzed. We employ momentum smearing to improve the overlap with the boosted $螖$ state significantly reducin… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1907.09827v1-abstract-full').style.display = 'inline'; document.getElementById('1907.09827v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1907.09827v1-abstract-full" style="display: none;"> We present results for renormalized matrix elements related to the unpolarized quasi-distribution function of the $螖^+$ baryon making use of the large momentum effective theory. Two ensembles of $N_f=2+1+1$ twisted mass fermions with a clover term and pion masses of 250 MeV and 330 MeV are analyzed. We employ momentum smearing to improve the overlap with the boosted $螖$ state significantly reducing in this way the statistical error of both two- and three-point functions. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1907.09827v1-abstract-full').style.display = 'none'; document.getElementById('1907.09827v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 23 July, 2019; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> July 2019. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">7 pages, 4 figures, conference</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1904.10013">arXiv:1904.10013</a> <span> [<a href="https://arxiv.org/pdf/1904.10013">pdf</a>, <a href="https://arxiv.org/format/1904.10013">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="High Energy Physics - Lattice">hep-lat</span> </div> </div> <p class="title is-5 mathjax"> Investigating volume effects for N$_f$=2 twisted clover fermions at the physical point </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-lat?searchtype=author&query=Alexandrou%2C+C">Constantia Alexandrou</a>, <a href="/search/hep-lat?searchtype=author&query=Bacchio%2C+S">Simone Bacchio</a>, <a href="/search/hep-lat?searchtype=author&query=Constantinou%2C+M">Martha Constantinou</a>, <a href="/search/hep-lat?searchtype=author&query=Howarth%2C+D">Dean Howarth</a>, <a href="/search/hep-lat?searchtype=author&query=Lauer%2C+C">Colin Lauer</a>, <a href="/search/hep-lat?searchtype=author&query=Hadjiyiannakou%2C+K">Kyriakos Hadjiyiannakou</a>, <a href="/search/hep-lat?searchtype=author&query=Koutsou%2C+G">Giannis Koutsou</a>, <a href="/search/hep-lat?searchtype=author&query=Jansen%2C+K">Karl Jansen</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1904.10013v2-abstract-short" style="display: inline;"> In this work we present preliminary results on the nucleon axial and tensor charges, the quark momentum fraction and the first moment of the helicity distribution. The simulations have been performed using two $N_f{=}2$ and $N_f{=}2{+}1{+}1$ ensembles. Both ensembles have a twisted mass action with a clover term with the quark masses fixed at their physical values (physical point) and volumes of… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1904.10013v2-abstract-full').style.display = 'inline'; document.getElementById('1904.10013v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1904.10013v2-abstract-full" style="display: none;"> In this work we present preliminary results on the nucleon axial and tensor charges, the quark momentum fraction and the first moment of the helicity distribution. The simulations have been performed using two $N_f{=}2$ and $N_f{=}2{+}1{+}1$ ensembles. Both ensembles have a twisted mass action with a clover term with the quark masses fixed at their physical values (physical point) and volumes of $64^3{\times}128$. The extracted quantities are compared with results from an existing $N_f{=}2$ ($48^3{\times}96$) ensemble. This comparison allows one to address volume and quenching effects. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1904.10013v2-abstract-full').style.display = 'none'; document.getElementById('1904.10013v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 24 April, 2019; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 22 April, 2019; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> April 2019. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">6 pages, Proceedings of the 36th Annual International Symposium on Lattice Field Theory - LATTICE2018</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1902.00587">arXiv:1902.00587</a> <span> [<a href="https://arxiv.org/pdf/1902.00587">pdf</a>, <a href="https://arxiv.org/format/1902.00587">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="High Energy Physics - Lattice">hep-lat</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Phenomenology">hep-ph</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevD.99.114504">10.1103/PhysRevD.99.114504 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Systematic uncertainties in parton distribution functions from lattice QCD simulations at the physical point </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-lat?searchtype=author&query=Alexandrou%2C+C">Constantia Alexandrou</a>, <a href="/search/hep-lat?searchtype=author&query=Cichy%2C+K">Krzysztof Cichy</a>, <a href="/search/hep-lat?searchtype=author&query=Constantinou%2C+M">Martha Constantinou</a>, <a href="/search/hep-lat?searchtype=author&query=Hadjiyiannakou%2C+K">Kyriakos Hadjiyiannakou</a>, <a href="/search/hep-lat?searchtype=author&query=Jansen%2C+K">Karl Jansen</a>, <a href="/search/hep-lat?searchtype=author&query=Scapellato%2C+A">Aurora Scapellato</a>, <a href="/search/hep-lat?searchtype=author&query=Steffens%2C+F">Fernanda Steffens</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1902.00587v1-abstract-short" style="display: inline;"> We present a detailed study of the helicity-dependent and helicity-independent collinear parton distribution functions (PDFs) of the nucleon, using the quasi-PDF approach. The lattice QCD computation is performed employing twisted mass fermions with a physical value of the light quark mass. We give a systematic and in-depth account of the salient features entering in the evaluation of quasi-PDFs a… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1902.00587v1-abstract-full').style.display = 'inline'; document.getElementById('1902.00587v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1902.00587v1-abstract-full" style="display: none;"> We present a detailed study of the helicity-dependent and helicity-independent collinear parton distribution functions (PDFs) of the nucleon, using the quasi-PDF approach. The lattice QCD computation is performed employing twisted mass fermions with a physical value of the light quark mass. We give a systematic and in-depth account of the salient features entering in the evaluation of quasi-PDFs and their relation to the light-cone PDFs. In particular, we give details for the computation of the matrix elements, including the study of the various sources of systematic uncertainties, such as excited states contamination. In addition, we discuss the non-perturbative renormalization scheme used here and its systematics, effects of truncating the Fourier transform and different matching prescriptions. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1902.00587v1-abstract-full').style.display = 'none'; document.getElementById('1902.00587v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 1 February, 2019; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> February 2019. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">47 pages, 33 figures, 6 tables</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. D 99, 114504 (2019) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1812.10311">arXiv:1812.10311</a> <span> [<a href="https://arxiv.org/pdf/1812.10311">pdf</a>, <a href="https://arxiv.org/format/1812.10311">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="High Energy Physics - Lattice">hep-lat</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Nuclear Theory">nucl-th</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevD.100.014509">10.1103/PhysRevD.100.014509 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Proton and neutron electromagnetic form factors from lattice QCD </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-lat?searchtype=author&query=Alexandrou%2C+C">C. Alexandrou</a>, <a href="/search/hep-lat?searchtype=author&query=Bacchio%2C+S">S. Bacchio</a>, <a href="/search/hep-lat?searchtype=author&query=Constantinou%2C+M">M. Constantinou</a>, <a href="/search/hep-lat?searchtype=author&query=Finkenrath%2C+J">J. Finkenrath</a>, <a href="/search/hep-lat?searchtype=author&query=Hadjiyiannakou%2C+K">K. Hadjiyiannakou</a>, <a href="/search/hep-lat?searchtype=author&query=Jansen%2C+K">K. Jansen</a>, <a href="/search/hep-lat?searchtype=author&query=Koutsou%2C+G">G. Koutsou</a>, <a href="/search/hep-lat?searchtype=author&query=Casco%2C+A+V+A">A. Vaquero Aviles Casco</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1812.10311v2-abstract-short" style="display: inline;"> The electromagnetic form factors of the proton and the neutron are computed within lattice QCD using simulations with quarks masses fixed to their physical values. Both connected and disconnected contributions are computed. We analyze two new ensembles of $N_f = 2$ and $N_f = 2 + 1 + 1$ twisted mass clover-improved fermions and determine the proton and neutron form factors, the electric and magnet… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1812.10311v2-abstract-full').style.display = 'inline'; document.getElementById('1812.10311v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1812.10311v2-abstract-full" style="display: none;"> The electromagnetic form factors of the proton and the neutron are computed within lattice QCD using simulations with quarks masses fixed to their physical values. Both connected and disconnected contributions are computed. We analyze two new ensembles of $N_f = 2$ and $N_f = 2 + 1 + 1$ twisted mass clover-improved fermions and determine the proton and neutron form factors, the electric and magnetic radii, and the magnetic moments. We use several values of the sink-source time separation in the range of 1.0 fm to 1.6 fm to ensure ground state identification. Disconnected contributions are calculated to an unprecedented accuracy at the physical point. Although they constitute a small correction, they are non-negligible and contribute up to 15% for the case of the neutron electric charge radius. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1812.10311v2-abstract-full').style.display = 'none'; document.getElementById('1812.10311v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 27 August, 2019; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 26 December, 2018; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> December 2018. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">26 pages and 34 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Report number:</span> DESY 18-033 </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. D 100, 014509 (2019) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1811.01589">arXiv:1811.01589</a> <span> [<a href="https://arxiv.org/pdf/1811.01589">pdf</a>, <a href="https://arxiv.org/format/1811.01589">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="High Energy Physics - Lattice">hep-lat</span> </div> </div> <p class="title is-5 mathjax"> Quasi-PDFs from Twisted mass fermions at the physical point </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-lat?searchtype=author&query=Alexandrou%2C+C">Constantia Alexandrou</a>, <a href="/search/hep-lat?searchtype=author&query=Cichy%2C+K">Krzysztof Cichy</a>, <a href="/search/hep-lat?searchtype=author&query=Constantinou%2C+M">Martha Constantinou</a>, <a href="/search/hep-lat?searchtype=author&query=Hadjiyiannakou%2C+K">Kyriakos Hadjiyiannakou</a>, <a href="/search/hep-lat?searchtype=author&query=Jansen%2C+K">Karl Jansen</a>, <a href="/search/hep-lat?searchtype=author&query=Scapellato%2C+A">Aurora Scapellato</a>, <a href="/search/hep-lat?searchtype=author&query=Steffens%2C+F">Fernanda Steffens</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1811.01589v1-abstract-short" style="display: inline;"> We present results for the flavor non-singlet u-d parton distribution functions within the nucleon using the quasi-PDF approach. The lattice calculation is performed by employing the twisted mass formulation and two gauge ensembles, having $N_f = 2$ and $N_f = 2 + 1 + 1$ dynamical fermions with masses tuned to their physical value. For the $N_f = 2$ physical point ensemble, the unpolarized, helici… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1811.01589v1-abstract-full').style.display = 'inline'; document.getElementById('1811.01589v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1811.01589v1-abstract-full" style="display: none;"> We present results for the flavor non-singlet u-d parton distribution functions within the nucleon using the quasi-PDF approach. The lattice calculation is performed by employing the twisted mass formulation and two gauge ensembles, having $N_f = 2$ and $N_f = 2 + 1 + 1$ dynamical fermions with masses tuned to their physical value. For the $N_f = 2$ physical point ensemble, the unpolarized, helicity and transversity distributions are computed for three values of the nucleon momentum, namely [6, 8, 10]$蟺/L$ corresponding to [0.83,1.11,1.38] GeV. Upon renormalization, we find that, as the nucleon momentum increases, the lattice results approach the phenomenological distributions resulting from analyses of deep inelastic scattering data, opening a promising path for a direct evaluation of parton distributions from the QCD Lagrangian. For the $N_f = 2 + 1 + 1$ physical point ensemble, we present preliminary results for the unpolarized distribution extracted from a nucleon boosted by $8蟺/L$ or 0.97 GeV. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1811.01589v1-abstract-full').style.display = 'none'; document.getElementById('1811.01589v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 5 November, 2018; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> November 2018. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">7 pages, 6 figures, The 36th International Symposium on Lattice Field Theory (Lattice 2018)</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1811.01588">arXiv:1811.01588</a> <span> [<a href="https://arxiv.org/pdf/1811.01588">pdf</a>, <a href="https://arxiv.org/format/1811.01588">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="High Energy Physics - Lattice">hep-lat</span> </div> </div> <p class="title is-5 mathjax"> Light-cone PDFs from Lattice QCD </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-lat?searchtype=author&query=Alexandrou%2C+C">Constantia Alexandrou</a>, <a href="/search/hep-lat?searchtype=author&query=Cichy%2C+K">Krzysztof Cichy</a>, <a href="/search/hep-lat?searchtype=author&query=Constantinou%2C+M">Martha Constantinou</a>, <a href="/search/hep-lat?searchtype=author&query=Hadjiyiannakou%2C+K">Kyriakos Hadjiyiannakou</a>, <a href="/search/hep-lat?searchtype=author&query=Jansen%2C+K">Karl Jansen</a>, <a href="/search/hep-lat?searchtype=author&query=Scapellato%2C+A">Aurora Scapellato</a>, <a href="/search/hep-lat?searchtype=author&query=Steffens%2C+F">Fernanda Steffens</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1811.01588v1-abstract-short" style="display: inline;"> Using the approach proposed a few years ago by X. Ji, it has become feasible to extract parton distribution functions (PDFs) from lattice QCD, a task thought to be extremely difficult before Ji's proposal. In this talk, we discuss this approach, in particular different systematic effects that need to be controlled to ultimately have precise determinations of PDFs. Special attention is paid to the… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1811.01588v1-abstract-full').style.display = 'inline'; document.getElementById('1811.01588v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1811.01588v1-abstract-full" style="display: none;"> Using the approach proposed a few years ago by X. Ji, it has become feasible to extract parton distribution functions (PDFs) from lattice QCD, a task thought to be extremely difficult before Ji's proposal. In this talk, we discuss this approach, in particular different systematic effects that need to be controlled to ultimately have precise determinations of PDFs. Special attention is paid to the analysis of excited states. We emphasize that it is crucial to control excited states contamination and we show an analysis thereof for our lattice data, used to calculate quasi-PDFs and finally light-cone PDFs in the second part of this proceeding (C. Alexandrou et al., Quasi-PDFs from Twisted mass fermions at the physical point). <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1811.01588v1-abstract-full').style.display = 'none'; document.getElementById('1811.01588v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 5 November, 2018; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> November 2018. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">Proceedings of the The 36th Annual International Symposium on Lattice Field Theory LATTICE 2018. 7 pages, 1 figure</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> PoS(LATTICE2018)094 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1807.11214">arXiv:1807.11214</a> <span> [<a href="https://arxiv.org/pdf/1807.11214">pdf</a>, <a href="https://arxiv.org/format/1807.11214">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="High Energy Physics - Lattice">hep-lat</span> </div> </div> <p class="title is-5 mathjax"> Nucleon spin structure from lattice QCD </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-lat?searchtype=author&query=Alexandrou%2C+C">Constantia Alexandrou</a>, <a href="/search/hep-lat?searchtype=author&query=Constantinou%2C+M">Martha Constantinou</a>, <a href="/search/hep-lat?searchtype=author&query=Hadjiyiannakou%2C+K">Kyriakos Hadjiyiannakou</a>, <a href="/search/hep-lat?searchtype=author&query=Jansen%2C+K">Karl Jansen</a>, <a href="/search/hep-lat?searchtype=author&query=Kallidonis%2C+C">Christos Kallidonis</a>, <a href="/search/hep-lat?searchtype=author&query=Koutsou%2C+G">Giannis Koutsou</a>, <a href="/search/hep-lat?searchtype=author&query=Avil%C3%A9s-Casco%2C+A+V">Alejandro Vaquero Avil茅s-Casco</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1807.11214v1-abstract-short" style="display: inline;"> In this lattice QCD study we evaluate the nucleon spin decomposition to quarks and gluons contributions. We employ one gauge ensemble of maximally twisted mass fermions with two degenerate light quarks tuned to approximately reproduce the physical pion mass. We find that both spin sum and momentum sum are satisfied within the current statistical and systematic accuracy. </span> <span class="abstract-full has-text-grey-dark mathjax" id="1807.11214v1-abstract-full" style="display: none;"> In this lattice QCD study we evaluate the nucleon spin decomposition to quarks and gluons contributions. We employ one gauge ensemble of maximally twisted mass fermions with two degenerate light quarks tuned to approximately reproduce the physical pion mass. We find that both spin sum and momentum sum are satisfied within the current statistical and systematic accuracy. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1807.11214v1-abstract-full').style.display = 'none'; document.getElementById('1807.11214v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 30 July, 2018; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> July 2018. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">DIS2018</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1807.11203">arXiv:1807.11203</a> <span> [<a href="https://arxiv.org/pdf/1807.11203">pdf</a>, <a href="https://arxiv.org/format/1807.11203">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="High Energy Physics - Lattice">hep-lat</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1051/epjconf/201817506003">10.1051/epjconf/201817506003 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Connected and disconnected contributions to nucleon axial form factors using $N_f=2$ twisted mass fermions at the physical point </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-lat?searchtype=author&query=Alexandrou%2C+C">Constantia Alexandrou</a>, <a href="/search/hep-lat?searchtype=author&query=Constantinou%2C+M">Martha Constantinou</a>, <a href="/search/hep-lat?searchtype=author&query=Hadjiyiannakou%2C+K">Kyriakos Hadjiyiannakou</a>, <a href="/search/hep-lat?searchtype=author&query=Jansen%2C+K">Karl Jansen</a>, <a href="/search/hep-lat?searchtype=author&query=Kallidonis%2C+C">Christos Kallidonis</a>, <a href="/search/hep-lat?searchtype=author&query=Koutsou%2C+G">Giannis Koutsou</a>, <a href="/search/hep-lat?searchtype=author&query=Avil%C3%A9s-Casco%2C+A+V">Alejandro Vaquero Avil茅s-Casco</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1807.11203v1-abstract-short" style="display: inline;"> We present results on the isovector and isoscalar nucleon axial form factors including disconnected contributions,using an ensemble of $N_f =2$ twisted mass clover- improved Wilson fermions simulated with approximately the physical value of the pion mass. The light disconnected quark loops are computed using exact deflation, while the strange and the charm quark loops are evaluated using the trunc… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1807.11203v1-abstract-full').style.display = 'inline'; document.getElementById('1807.11203v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1807.11203v1-abstract-full" style="display: none;"> We present results on the isovector and isoscalar nucleon axial form factors including disconnected contributions,using an ensemble of $N_f =2$ twisted mass clover- improved Wilson fermions simulated with approximately the physical value of the pion mass. The light disconnected quark loops are computed using exact deflation, while the strange and the charm quark loops are evaluated using the truncated solver method. Techniques such as the summation and the two-state fits have been employed to access ground-state dominance. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1807.11203v1-abstract-full').style.display = 'none'; document.getElementById('1807.11203v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 30 July, 2018; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> July 2018. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> EPJ Web Conf. 175 (2018) 06003 </p> </li> </ol> <nav class="pagination is-small is-centered breathe-horizontal" role="navigation" aria-label="pagination"> <a href="" class="pagination-previous is-invisible">Previous </a> <a href="/search/?searchtype=author&query=Hadjiyiannakou%2C+K&start=50" class="pagination-next" >Next 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