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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=Negele%2C+J+W&start=50" class="pagination-next" >Next </a> <ul class="pagination-list"> <li> <a href="/search/?searchtype=author&query=Negele%2C+J+W&start=0" class="pagination-link is-current" aria-label="Goto page 1">1 </a> </li> <li> <a href="/search/?searchtype=author&query=Negele%2C+J+W&start=50" class="pagination-link " aria-label="Page 2" aria-current="page">2 </a> </li> <li> <a href="/search/?searchtype=author&query=Negele%2C+J+W&start=100" class="pagination-link " aria-label="Page 3" aria-current="page">3 </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/2401.05360">arXiv:2401.05360</a> <span> [<a href="https://arxiv.org/pdf/2401.05360">pdf</a>, <a href="https://arxiv.org/format/2401.05360">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.109.074508">10.1103/PhysRevD.109.074508 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Moments of Nucleon Unpolarized, Polarized, and Transversity Parton Distribution Functions 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=Rodekamp%2C+M">Marcel Rodekamp</a>, <a href="/search/hep-lat?searchtype=author&query=Engelhardt%2C+M">Michael Engelhardt</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=Krieg%2C+S">Stefan Krieg</a>, <a href="/search/hep-lat?searchtype=author&query=Liuti%2C+S">Simonetta Liuti</a>, <a href="/search/hep-lat?searchtype=author&query=Meinel%2C+S">Stefan Meinel</a>, <a href="/search/hep-lat?searchtype=author&query=Negele%2C+J+W">John W. Negele</a>, <a href="/search/hep-lat?searchtype=author&query=Pochinsky%2C+A">Andrew Pochinsky</a>, <a href="/search/hep-lat?searchtype=author&query=Syritsyn%2C+S">Sergey Syritsyn</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="2401.05360v3-abstract-short" style="display: inline;"> The second Mellin moments $\langle x\rangle$ of the nucleon's unpolarized, polarized, and transversity parton distribution functions (PDFs) are computed. Two lattice QCD ensembles at the physical pion mass are used: these were generated using a tree-level Symanzik-improved gauge action and 2+1 flavour tree-level improved Wilson Clover fermions coupling via 2-level HEX-smearing. The moments are ext… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2401.05360v3-abstract-full').style.display = 'inline'; document.getElementById('2401.05360v3-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2401.05360v3-abstract-full" style="display: none;"> The second Mellin moments $\langle x\rangle$ of the nucleon's unpolarized, polarized, and transversity parton distribution functions (PDFs) are computed. Two lattice QCD ensembles at the physical pion mass are used: these were generated using a tree-level Symanzik-improved gauge action and 2+1 flavour tree-level improved Wilson Clover fermions coupling via 2-level HEX-smearing. The moments are extracted from forward matrix elements of local leading twist operators. We determine renomalization factors in RI-(S)MOM and match to $\overline{\mathrm{MS}}$ at scale $2\,\mathrm{GeV}$. Our findings show that operators that exhibit vanishing kinematics at zero momentum can have significantly reduced excited-state contamination. The resulting polarized moment is used to quantify the longitudinal contribution to the quark spin-orbit correlation. All our results agree within two sigma with previous lattice results. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2401.05360v3-abstract-full').style.display = 'none'; document.getElementById('2401.05360v3-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 April, 2024; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 12 December, 2023; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> January 2024. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Report number:</span> DESY-23-212 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2306.14431">arXiv:2306.14431</a> <span> [<a href="https://arxiv.org/pdf/2306.14431">pdf</a>, <a href="https://arxiv.org/format/2306.14431">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"> Moments of Parton Distributions Functions 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=Rodekamp%2C+M">Marcel Rodekamp</a>, <a href="/search/hep-lat?searchtype=author&query=Engelhardt%2C+M">Michael Engelhardt</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=Krieg%2C+S">Stefan Krieg</a>, <a href="/search/hep-lat?searchtype=author&query=Meinel%2C+S">Stefan Meinel</a>, <a href="/search/hep-lat?searchtype=author&query=Negele%2C+J+W">John W. Negele</a>, <a href="/search/hep-lat?searchtype=author&query=Pochinsky%2C+A">Andrew Pochinsky</a>, <a href="/search/hep-lat?searchtype=author&query=Syritsyn%2C+S">Sergey Syritsyn</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="2306.14431v2-abstract-short" style="display: inline;"> We present a Lattice QCD calculation of the second Mellin moments of the nucleon axial, vector and tensor parton distribution functions (PDFs). The calculation is performed at the physical pion mass with two different lattice spacings, and includes both zero and non-zero nucleon momenta. In our preliminary analysis, we identify operators that greatly reduce excited-state contamination. </span> <span class="abstract-full has-text-grey-dark mathjax" id="2306.14431v2-abstract-full" style="display: none;"> We present a Lattice QCD calculation of the second Mellin moments of the nucleon axial, vector and tensor parton distribution functions (PDFs). The calculation is performed at the physical pion mass with two different lattice spacings, and includes both zero and non-zero nucleon momenta. In our preliminary analysis, we identify operators that greatly reduce excited-state contamination. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2306.14431v2-abstract-full').style.display = 'none'; document.getElementById('2306.14431v2-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 July, 2023; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 26 June, 2023; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> June 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">DIS2023</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Report number:</span> DESY-23-072 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1907.11950">arXiv:1907.11950</a> <span> [<a href="https://arxiv.org/pdf/1907.11950">pdf</a>, <a href="https://arxiv.org/format/1907.11950">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.100.074510">10.1103/PhysRevD.100.074510 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Excited-state effects in nucleon structure on the lattice using hybrid interpolators </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-lat?searchtype=author&query=Green%2C+J+R">Jeremy R. Green</a>, <a href="/search/hep-lat?searchtype=author&query=Engelhardt%2C+M">Michael Engelhardt</a>, <a href="/search/hep-lat?searchtype=author&query=Hasan%2C+N">Nesreen Hasan</a>, <a href="/search/hep-lat?searchtype=author&query=Krieg%2C+S">Stefan Krieg</a>, <a href="/search/hep-lat?searchtype=author&query=Meinel%2C+S">Stefan Meinel</a>, <a href="/search/hep-lat?searchtype=author&query=Negele%2C+J+W">John W. Negele</a>, <a href="/search/hep-lat?searchtype=author&query=Pochinsky%2C+A+V">Andrew V. Pochinsky</a>, <a href="/search/hep-lat?searchtype=author&query=Syritsyn%2C+S+N">Sergey N. Syritsyn</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="1907.11950v1-abstract-short" style="display: inline;"> It would be very useful to find a way of reducing excited-state effects in lattice QCD calculations of nucleon structure that has a low computational cost. We explore the use of hybrid interpolators, which contain a nontrivial gluonic excitation, in a variational basis together with the standard interpolator with tuned smearing width. Using the clover discretization of the field strength tensor, a… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1907.11950v1-abstract-full').style.display = 'inline'; document.getElementById('1907.11950v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1907.11950v1-abstract-full" style="display: none;"> It would be very useful to find a way of reducing excited-state effects in lattice QCD calculations of nucleon structure that has a low computational cost. We explore the use of hybrid interpolators, which contain a nontrivial gluonic excitation, in a variational basis together with the standard interpolator with tuned smearing width. Using the clover discretization of the field strength tensor, a calculation using a fixed linear combination of standard and hybrid interpolators can be done using the same number of quark propagators as a standard calculation, making this a cost-effective option. We find that such an interpolator, optimized by solving a generalized eigenvalue problem, reduces excited-state contributions in two-point correlators. However, the effect in three-point correlators, which are needed for computing nucleon matrix elements, is mixed: for some matrix elements such as the tensor charge, excited-state effects are suppressed, whereas for others such as the axial charge, they are enhanced. The results illustrate that the variational method is not guaranteed to reduce the net contribution from excited states except in its asymptotic regime, and suggest that it may be important to use a large basis of interpolators capable of isolating all of the relevant low-lying states. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1907.11950v1-abstract-full').style.display = 'none'; document.getElementById('1907.11950v1-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 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">12 pages, 8 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Report number:</span> DESY 19-132 </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. D 100, 074510 (2019) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1811.10034">arXiv:1811.10034</a> <span> [<a href="https://arxiv.org/pdf/1811.10034">pdf</a>, <a href="https://arxiv.org/format/1811.10034">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"> Calculating the $蟻$ radiative decay width with lattice QCD </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-lat?searchtype=author&query=Leskovec%2C+L">Luka Leskovec</a>, <a href="/search/hep-lat?searchtype=author&query=Alexandrou%2C+C">Constantia Alexandrou</a>, <a href="/search/hep-lat?searchtype=author&query=Meinel%2C+S">Stefan Meinel</a>, <a href="/search/hep-lat?searchtype=author&query=Negele%2C+J+W">John W. Negele</a>, <a href="/search/hep-lat?searchtype=author&query=Paul%2C+S">Srijit Paul</a>, <a href="/search/hep-lat?searchtype=author&query=Petschlies%2C+M">Marcus Petschlies</a>, <a href="/search/hep-lat?searchtype=author&query=Pochinsky%2C+A">Andrew Pochinsky</a>, <a href="/search/hep-lat?searchtype=author&query=Rendon%2C+G">Gumaro Rendon</a>, <a href="/search/hep-lat?searchtype=author&query=Syritsyn%2C+S">Sergey Syritsyn</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="1811.10034v1-abstract-short" style="display: inline;"> We present the results of our lattice QCD study of the $蟺纬\to蟺蟺$ process, where the $蟻$ resonance appears as an enhancement in the transition amplitude. We use $N_f=2+1$ clover fermions on a lattice of $L=3.6$ fm and a pion mass of $320$ MeV. Using a combination of forward, stochastic, and sequential propagators, we calculate the two-point and three-point functions that allow us to determine the… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1811.10034v1-abstract-full').style.display = 'inline'; document.getElementById('1811.10034v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1811.10034v1-abstract-full" style="display: none;"> We present the results of our lattice QCD study of the $蟺纬\to蟺蟺$ process, where the $蟻$ resonance appears as an enhancement in the transition amplitude. We use $N_f=2+1$ clover fermions on a lattice of $L=3.6$ fm and a pion mass of $320$ MeV. Using a combination of forward, stochastic, and sequential propagators, we calculate the two-point and three-point functions that allow us to determine the $蟺纬\to蟺蟺$ matrix elements for several values of the invariant mass $s$ and momentum transfer $q^2$. To fit the $q^2$ and $s$ dependence of the $蟺纬\to蟺蟺$ amplitude, we explore a set of general parametrizations based on a Taylor expansion. By analytic continuation to the complex pole corresponding to the $蟻$ resonance, we determine the resonant form factors and calculate the radiative decay width of the $蟻$. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1811.10034v1-abstract-full').style.display = 'none'; document.getElementById('1811.10034v1-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 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, 3 figures, Contribution to The 36th Annual International Symposium on Lattice Field Theory (Lattice 2018)</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Report number:</span> JLAB-THY-18-2874 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1810.01927">arXiv:1810.01927</a> <span> [<a href="https://arxiv.org/pdf/1810.01927">pdf</a>, <a href="https://arxiv.org/format/1810.01927">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"> A Lattice QCD study of the $蟻$ resonance </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-lat?searchtype=author&query=Leskovec%2C+L">Luka Leskovec</a>, <a href="/search/hep-lat?searchtype=author&query=Alexandrou%2C+C">Constantia Alexandrou</a>, <a href="/search/hep-lat?searchtype=author&query=Meinel%2C+S">Stefan Meinel</a>, <a href="/search/hep-lat?searchtype=author&query=Negele%2C+J+W">John W. Negele</a>, <a href="/search/hep-lat?searchtype=author&query=Paul%2C+S">Srijit Paul</a>, <a href="/search/hep-lat?searchtype=author&query=Petschlies%2C+M">Marcus Petschlies</a>, <a href="/search/hep-lat?searchtype=author&query=Pochinsky%2C+A">Andrew Pochinsky</a>, <a href="/search/hep-lat?searchtype=author&query=Rendon%2C+G">Gumaro Rendon</a>, <a href="/search/hep-lat?searchtype=author&query=Syritsyn%2C+S">Sergey Syritsyn</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="1810.01927v1-abstract-short" style="display: inline;"> We present a lattice QCD study of the $蟻$ resonance with $N_f=2+1$ clover fermions at a pion mass of approximately $320$ MeV and lattice size $3.6$ fm. We consider two processes involving the $蟻$. The first process is elastic scattering of two pions in P-wave with isospin $1$. Using the L眉scher method we determine the scattering phase shift, from which we obtain the $蟻$ resonance mass and decay wi… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1810.01927v1-abstract-full').style.display = 'inline'; document.getElementById('1810.01927v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1810.01927v1-abstract-full" style="display: none;"> We present a lattice QCD study of the $蟻$ resonance with $N_f=2+1$ clover fermions at a pion mass of approximately $320$ MeV and lattice size $3.6$ fm. We consider two processes involving the $蟻$. The first process is elastic scattering of two pions in P-wave with isospin $1$. Using the L眉scher method we determine the scattering phase shift, from which we obtain the $蟻$ resonance mass and decay width $螕(蟻\to蟺蟺)$. The second process is the radiative transition $蟺纬\to蟺蟺$, where we follow the Brice帽o-Hansen-Walker-Loud approach to determine the transition amplitude in the invariant mass region near the $蟻$ resonance and for both space- and time-like photon momentum. This allows us to determine the coupling between the $蟻$, the pion and the photon, and the resulting $蟻$ radiative decay width. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1810.01927v1-abstract-full').style.display = 'none'; document.getElementById('1810.01927v1-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 October, 2018; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> October 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">Talk presented at CIPANP2018. 8 pages, LaTeX, 3 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Report number:</span> CIPANP2018-Leskovec </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1706.03406">arXiv:1706.03406</a> <span> [<a href="https://arxiv.org/pdf/1706.03406">pdf</a>, <a href="https://arxiv.org/format/1706.03406">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.96.094508">10.1103/PhysRevD.96.094508 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Nucleon Transverse Momentum-dependent Parton Distributions in Lattice QCD: Renormalization Patterns and Discretization Effects </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-lat?searchtype=author&query=Yoon%2C+B">Boram Yoon</a>, <a href="/search/hep-lat?searchtype=author&query=Engelhardt%2C+M">Michael Engelhardt</a>, <a href="/search/hep-lat?searchtype=author&query=Gupta%2C+R">Rajan Gupta</a>, <a href="/search/hep-lat?searchtype=author&query=Bhattacharya%2C+T">Tanmoy Bhattacharya</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=Musch%2C+B+U">Bernhard U. Musch</a>, <a href="/search/hep-lat?searchtype=author&query=Negele%2C+J+W">John W. Negele</a>, <a href="/search/hep-lat?searchtype=author&query=Pochinsky%2C+A+V">Andrew V. Pochinsky</a>, <a href="/search/hep-lat?searchtype=author&query=Schaefer%2C+A">Andreas Schaefer</a>, <a href="/search/hep-lat?searchtype=author&query=Syritsyn%2C+S+N">Sergey N. Syritsyn</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="1706.03406v1-abstract-short" style="display: inline;"> Lattice QCD calculations of transverse momentum-dependent parton distribution functions (TMDs) in nucleons are presented, based on the evaluation of nucleon matrix elements of quark bilocal operators with a staple-shaped gauge connection. Both time-reversal odd effects, namely, the generalized Sivers and Boer-Mulders transverse momentum shifts, as well as time-reversal even effects, namely, the ge… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1706.03406v1-abstract-full').style.display = 'inline'; document.getElementById('1706.03406v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1706.03406v1-abstract-full" style="display: none;"> Lattice QCD calculations of transverse momentum-dependent parton distribution functions (TMDs) in nucleons are presented, based on the evaluation of nucleon matrix elements of quark bilocal operators with a staple-shaped gauge connection. Both time-reversal odd effects, namely, the generalized Sivers and Boer-Mulders transverse momentum shifts, as well as time-reversal even effects, namely, the generalized transversity and one of the generalized worm-gear shifts are studied. Results are obtained on two different $n_f = 2+1$ flavor ensembles with approximately matching pion masses but very different discretization schemes: domain-wall fermions (DWF) with lattice spacing $a=0.084$ fm and pion mass 297 MeV, and Wilson-clover fermions with $a=0.114$ fm and pion mass 317 MeV. Comparison of the results on the two ensembles yields insight into the length scales at which lattice discretization errors are small, and into the extent to which the renormalization pattern obeyed by the continuum QCD TMD operator continues to apply in the lattice formulation. For the studied TMD observables, the results are found to be consistent between the two ensembles at sufficiently large separation of the quark fields within the operator, whereas deviations are observed in the local limit and in the case of a straight link gauge connection, which is relevant to the studies of parton distribution functions. Furthermore, the lattice estimates of the generalized Sivers shift obtained here are confronted with, and are seen to tend towards, a phenomenological estimate extracted from experimental data. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1706.03406v1-abstract-full').style.display = 'none'; document.getElementById('1706.03406v1-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 June, 2017; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> June 2017. </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">16 pages and 15 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Report number:</span> LA-UR-17-24472 </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. D 96, 094508 (2017) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1611.00282">arXiv:1611.00282</a> <span> [<a href="https://arxiv.org/pdf/1611.00282">pdf</a>, <a href="https://arxiv.org/format/1611.00282">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"> A study of the radiative transition $蟺蟺\to 蟺纬^{*}$ with lattice QCD </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-lat?searchtype=author&query=Leskovec%2C+L">Luka Leskovec</a>, <a href="/search/hep-lat?searchtype=author&query=Alexandrou%2C+C">Constantia Alexandrou</a>, <a href="/search/hep-lat?searchtype=author&query=Koutsou%2C+G">Giannis Koutsou</a>, <a href="/search/hep-lat?searchtype=author&query=Meinel%2C+S">Stefan Meinel</a>, <a href="/search/hep-lat?searchtype=author&query=Negele%2C+J+W">John W. Negele</a>, <a href="/search/hep-lat?searchtype=author&query=Paul%2C+S">Srijit Paul</a>, <a href="/search/hep-lat?searchtype=author&query=Petschlies%2C+M">Marcus Petschlies</a>, <a href="/search/hep-lat?searchtype=author&query=Pochinsky%2C+A">Andrew Pochinsky</a>, <a href="/search/hep-lat?searchtype=author&query=Rendon%2C+G">Gumaro Rendon</a>, <a href="/search/hep-lat?searchtype=author&query=Syritsyn%2C+S">Sergey Syritsyn</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="1611.00282v1-abstract-short" style="display: inline;"> Lattice QCD calculations of radiative transitions between hadrons have in the past been limited to processes of hadrons stable under the strong interaction. Recently developed methods for $1\to2$ transition matrix elements in a finite volume now enable the determination of radiative decay rates of strongly unstable particles. Our lattice QCD study focuses on the process $蟺蟺\to 蟺纬^{*}$, where the… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1611.00282v1-abstract-full').style.display = 'inline'; document.getElementById('1611.00282v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1611.00282v1-abstract-full" style="display: none;"> Lattice QCD calculations of radiative transitions between hadrons have in the past been limited to processes of hadrons stable under the strong interaction. Recently developed methods for $1\to2$ transition matrix elements in a finite volume now enable the determination of radiative decay rates of strongly unstable particles. Our lattice QCD study focuses on the process $蟺蟺\to 蟺纬^{*}$, where the $蟻$ meson is present as an enhancement in the cross-section. We use $2+1$ flavors of clover fermions at a pion mass of approximately $320$ MeV and a lattice size of approximately $3.6$ fm. The required $2$-point and $3$-point correlation functions are constructed from a set of forward, sequential and stochastic light quark propagators. In addition to determining the $蟻$ meson resonance parameters via the L眉scher method, the scattering phase shift is used in conjunction with the $1\to2$ transition matrix element formalism of Brice帽o, Hansen and Walker-Loud to compute the $蟺蟺\to蟺纬^{*}$ amplitude at several values of the momentum transfer and $蟺蟺$ invariant mass. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1611.00282v1-abstract-full').style.display = 'none'; document.getElementById('1611.00282v1-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 November, 2016; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> November 2016. </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, presented at the 34th International Symposium on Lattice Field Theory (Lattice 2016), 24-30 July 2016, Southampton, UK</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1511.02752">arXiv:1511.02752</a> <span> [<a href="https://arxiv.org/pdf/1511.02752">pdf</a>, <a href="https://arxiv.org/format/1511.02752">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"> Calculation of the decay width of decuplet baryons </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=Negele%2C+J+W">John W. Negele</a>, <a href="/search/hep-lat?searchtype=author&query=Petschlies%2C+M">Marcus Petschlies</a>, <a href="/search/hep-lat?searchtype=author&query=Pochinsky%2C+A+V">Andrew V. Pochinsky</a>, <a href="/search/hep-lat?searchtype=author&query=Syritsyn%2C+S+S">Sergey S. Syritsyn</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="1511.02752v1-abstract-short" style="display: inline;"> We calculate the coupling constant and decay width of the decuplet to octet baryon transitions in lattice QCD using the transfer matrix method. The transition amplitude is related to the coupling constant and via the Fermi's Golden Rule to the decay width. The method is applicable for near-degeneracy of the energy levels of initial and final states and, when this condition is fulfilled, yields a g… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1511.02752v1-abstract-full').style.display = 'inline'; document.getElementById('1511.02752v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1511.02752v1-abstract-full" style="display: none;"> We calculate the coupling constant and decay width of the decuplet to octet baryon transitions in lattice QCD using the transfer matrix method. The transition amplitude is related to the coupling constant and via the Fermi's Golden Rule to the decay width. The method is applicable for near-degeneracy of the energy levels of initial and final states and, when this condition is fulfilled, yields a good estimate of the decay width. We present results using a hybrid action with domain wall valence quarks on a staggered sea with $350$ MeV pion mass as well as for a domain wall fermion action with $180$ MeV pion mass. We find $螕\left( 螖\to 蟺\,N \right) = 119\,( 8)\,( 8)$ MeV for the transition of Delta to pion-nucleon within the unitary domain wall setup. We also report values for the decay widths of the $危^*$ and $螢*$ baryons. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1511.02752v1-abstract-full').style.display = 'none'; document.getElementById('1511.02752v1-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 November, 2015; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> November 2015. </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 proceedings of the 33rd International Symposium on Lattice Field Theory (Lattice 2015), Kobe, Japan</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1507.02724">arXiv:1507.02724</a> <span> [<a href="https://arxiv.org/pdf/1507.02724">pdf</a>, <a href="https://arxiv.org/format/1507.02724">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.93.114515">10.1103/PhysRevD.93.114515 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Study of decuplet baryon resonances 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=Negele%2C+J+W">John W. Negele</a>, <a href="/search/hep-lat?searchtype=author&query=Petschlies%2C+M">Marcus Petschlies</a>, <a href="/search/hep-lat?searchtype=author&query=Pochinsky%2C+A+V">Andrew V. Pochinsky</a>, <a href="/search/hep-lat?searchtype=author&query=Syritsyn%2C+S+N">Sergey N. Syritsyn</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="1507.02724v2-abstract-short" style="display: inline;"> A lattice QCD study of the strong decay width and coupling constant of decuplet baryons to an octet baryon - pion state is presented. The transfer matrix method is used to obtain the overlap of lattice states with decuplet baryon quantum numbers on the one hand and octet baryon-pion quantum numbers on the other as an approximation to the matrix element of the corresponding transition. By making us… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1507.02724v2-abstract-full').style.display = 'inline'; document.getElementById('1507.02724v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1507.02724v2-abstract-full" style="display: none;"> A lattice QCD study of the strong decay width and coupling constant of decuplet baryons to an octet baryon - pion state is presented. The transfer matrix method is used to obtain the overlap of lattice states with decuplet baryon quantum numbers on the one hand and octet baryon-pion quantum numbers on the other as an approximation to the matrix element of the corresponding transition. By making use of leading order effective field theory, the coupling constants, as well as the widths for the various decay channels are determined. The transitions studied are $ 螖\to 蟺\,N$, $危^* \to 螞\,蟺$, $危^* \to 危\,蟺$ and $螢^* \to 螢\,蟺$. We obtain results for two ensembles of $N_f=2+1$ dynamical fermion configurations, one using domain wall valence quarks on a staggered sea at a pion mass of $350\,\mathrm{MeV}$ and a box size of $3.4\,\mathrm{fm}$ and a second one using domain wall sea and valence quarks at pion mass $180\,\mathrm{MeV}$ and box size $4.5\,\mathrm{fm}$. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1507.02724v2-abstract-full').style.display = 'none'; document.getElementById('1507.02724v2-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 June, 2016; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 9 July, 2015; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> July 2015. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. D 93, 114515 (2016) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1404.4029">arXiv:1404.4029</a> <span> [<a href="https://arxiv.org/pdf/1404.4029">pdf</a>, <a href="https://arxiv.org/format/1404.4029">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.90.074507">10.1103/PhysRevD.90.074507 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Nucleon electromagnetic form factors from lattice QCD using a nearly physical pion mass </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-lat?searchtype=author&query=Green%2C+J+R">J. R. Green</a>, <a href="/search/hep-lat?searchtype=author&query=Negele%2C+J+W">J. W. Negele</a>, <a href="/search/hep-lat?searchtype=author&query=Pochinsky%2C+A+V">A. V. Pochinsky</a>, <a href="/search/hep-lat?searchtype=author&query=Syritsyn%2C+S+N">S. N. Syritsyn</a>, <a href="/search/hep-lat?searchtype=author&query=Engelhardt%2C+M">M. Engelhardt</a>, <a href="/search/hep-lat?searchtype=author&query=Krieg%2C+S">S. Krieg</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="1404.4029v2-abstract-short" style="display: inline;"> We present lattice QCD calculations of nucleon electromagnetic form factors using pion masses $m_蟺$ = 149, 202, and 254 MeV and an action with clover-improved Wilson quarks coupled to smeared gauge fields, as used by the Budapest-Marseille-Wuppertal collaboration. Particular attention is given to removal of the effects of excited state contamination by calculation at three source-sink separations… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1404.4029v2-abstract-full').style.display = 'inline'; document.getElementById('1404.4029v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1404.4029v2-abstract-full" style="display: none;"> We present lattice QCD calculations of nucleon electromagnetic form factors using pion masses $m_蟺$ = 149, 202, and 254 MeV and an action with clover-improved Wilson quarks coupled to smeared gauge fields, as used by the Budapest-Marseille-Wuppertal collaboration. Particular attention is given to removal of the effects of excited state contamination by calculation at three source-sink separations and use of the summation and generalized pencil-of-function methods. The combination of calculation at the nearly physical mass $m_蟺$ = 149 MeV in a large spatial volume ($m_蟺L_s$ = 4.2) and removal of excited state effects yields agreement with experiment for the electric and magnetic form factors $G_E(Q^2)$ and $G_M(Q^2)$ up to $Q^2$ = 0.5 GeV$^2$. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1404.4029v2-abstract-full').style.display = 'none'; document.getElementById('1404.4029v2-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 November, 2014; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 15 April, 2014; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> April 2014. </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">v2: published version; 30 pages, 25 figures, 6 tables</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Report number:</span> MIT-CTP 4456, WUB/13-13, BNL-104912-2014-JA </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. D 90, 074507 (2014) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1401.3507">arXiv:1401.3507</a> <span> [<a href="https://arxiv.org/pdf/1401.3507">pdf</a>, <a href="https://arxiv.org/format/1401.3507">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"> Determination of the Delta resonance width 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=Negele%2C+J+W">J. W. Negele</a>, <a href="/search/hep-lat?searchtype=author&query=Petschlies%2C+M">M. 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="1401.3507v1-abstract-short" style="display: inline;"> A method suitable for extracting resonance parameters of unstable baryons in lattice QCD is examined. The method is applied to the strong decay of the Delta to a pion-nucleon state, extracting the pi-N - Delta coupling constant and Delta decay width. </span> <span class="abstract-full has-text-grey-dark mathjax" id="1401.3507v1-abstract-full" style="display: none;"> A method suitable for extracting resonance parameters of unstable baryons in lattice QCD is examined. The method is applied to the strong decay of the Delta to a pion-nucleon state, extracting the pi-N - Delta coupling constant and Delta decay width. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1401.3507v1-abstract-full').style.display = 'none'; document.getElementById('1401.3507v1-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 January, 2014; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> January 2014. </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 contribution to Lattice 2013, 7 pages</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1305.6081">arXiv:1305.6081</a> <span> [<a href="https://arxiv.org/pdf/1305.6081">pdf</a>, <a href="https://arxiv.org/ps/1305.6081">ps</a>, <a href="https://arxiv.org/format/1305.6081">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.88.031501">10.1103/PhysRevD.88.031501 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Determination of Delta resonance parameters 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=Negele%2C+J+W">J. W. Negele</a>, <a href="/search/hep-lat?searchtype=author&query=Petschlies%2C+M">M. Petschlies</a>, <a href="/search/hep-lat?searchtype=author&query=Strelchenko%2C+A">A. Strelchenko</a>, <a href="/search/hep-lat?searchtype=author&query=Tsapalis%2C+A">A. Tsapalis</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="1305.6081v1-abstract-short" style="display: inline;"> A method suitable for extracting resonance parameters of unstable baryons in lattice QCD is examined. The method is applied to the strong decay of the Delta to a pion-nucleon state, extracting the pion-nucleon - Delta coupling constant and Delta decay width. </span> <span class="abstract-full has-text-grey-dark mathjax" id="1305.6081v1-abstract-full" style="display: none;"> A method suitable for extracting resonance parameters of unstable baryons in lattice QCD is examined. The method is applied to the strong decay of the Delta to a pion-nucleon state, extracting the pion-nucleon - Delta coupling constant and Delta decay width. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1305.6081v1-abstract-full').style.display = 'none'; document.getElementById('1305.6081v1-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 May, 2013; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> May 2013. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1304.4614">arXiv:1304.4614</a> <span> [<a href="https://arxiv.org/pdf/1304.4614">pdf</a>, <a href="https://arxiv.org/ps/1304.4614">ps</a>, <a href="https://arxiv.org/format/1304.4614">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.87.114513">10.1103/PhysRevD.87.114513 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Determination of the $螖(1232)$ axial and pseudoscalar 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=Gregory%2C+E+B">E. B. Gregory</a>, <a href="/search/hep-lat?searchtype=author&query=Korzec%2C+T">T. Korzec</a>, <a href="/search/hep-lat?searchtype=author&query=Koutsou%2C+G">G. Koutsou</a>, <a href="/search/hep-lat?searchtype=author&query=Negele%2C+J+W">J. W. Negele</a>, <a href="/search/hep-lat?searchtype=author&query=Sato%2C+T">T. Sato</a>, <a href="/search/hep-lat?searchtype=author&query=Tsapalis%2C+A">A. Tsapalis</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="1304.4614v1-abstract-short" style="display: inline;"> We present a lattice QCD calculation of the $螖(1232)$ matrix elements of the axial-vector and pseudoscalar currents. The decomposition of these matrix elements into the appropriate Lorentz invariant form factors is carried out and the techniques to calculate the form factors are developed and tested using quenched configurations. Results are obtained for 2+1 domain wall fermions and within a hybri… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1304.4614v1-abstract-full').style.display = 'inline'; document.getElementById('1304.4614v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1304.4614v1-abstract-full" style="display: none;"> We present a lattice QCD calculation of the $螖(1232)$ matrix elements of the axial-vector and pseudoscalar currents. The decomposition of these matrix elements into the appropriate Lorentz invariant form factors is carried out and the techniques to calculate the form factors are developed and tested using quenched configurations. Results are obtained for 2+1 domain wall fermions and within a hybrid scheme with domain wall valence and staggered sea quarks. Two Goldberger-Treiman type relations connecting the axial to the pseudoscalar effective couplings are derived. These and further relations based on the pion-pole dominance hypothesis are examined using the lattice QCD results, finding support for their validity. Utilizing lattice QCD results on the axial charges of the nucleon and the $螖$, as well as the nucleon-to-$螖$ transition coupling constant, we perform a combined chiral fit to all three quantities and study their pion mass dependence as the chiral limit is approached. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1304.4614v1-abstract-full').style.display = 'none'; document.getElementById('1304.4614v1-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> 16 April, 2013; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> April 2013. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1209.1687">arXiv:1209.1687</a> <span> [<a href="https://arxiv.org/pdf/1209.1687">pdf</a>, <a href="https://arxiv.org/format/1209.1687">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/10.1016/j.physletb.2014.05.075">10.1016/j.physletb.2014.05.075 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Nucleon Structure from Lattice QCD Using a Nearly Physical Pion Mass </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-lat?searchtype=author&query=Green%2C+J+R">J. R. Green</a>, <a href="/search/hep-lat?searchtype=author&query=Engelhardt%2C+M">M. Engelhardt</a>, <a href="/search/hep-lat?searchtype=author&query=Krieg%2C+S">S. Krieg</a>, <a href="/search/hep-lat?searchtype=author&query=Negele%2C+J+W">J. W. Negele</a>, <a href="/search/hep-lat?searchtype=author&query=Pochinsky%2C+A+V">A. V. Pochinsky</a>, <a href="/search/hep-lat?searchtype=author&query=Syritsyn%2C+S+N">S. N. Syritsyn</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="1209.1687v2-abstract-short" style="display: inline;"> We report the first Lattice QCD calculation using the almost physical pion mass mpi=149 MeV that agrees with experiment for four fundamental isovector observables characterizing the gross structure of the nucleon: the Dirac and Pauli radii, the magnetic moment, and the quark momentum fraction. The key to this success is the combination of using a nearly physical pion mass and excluding the contrib… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1209.1687v2-abstract-full').style.display = 'inline'; document.getElementById('1209.1687v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1209.1687v2-abstract-full" style="display: none;"> We report the first Lattice QCD calculation using the almost physical pion mass mpi=149 MeV that agrees with experiment for four fundamental isovector observables characterizing the gross structure of the nucleon: the Dirac and Pauli radii, the magnetic moment, and the quark momentum fraction. The key to this success is the combination of using a nearly physical pion mass and excluding the contributions of excited states. An analogous calculation of the nucleon axial charge governing beta decay has inconsistencies indicating a source of bias at low pion masses not present for the other observables and yields a result that disagrees with experiment. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1209.1687v2-abstract-full').style.display = 'none'; document.getElementById('1209.1687v2-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> 31 July, 2014; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 8 September, 2012; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> September 2012. </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">journal version; 15 pages, 6 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Report number:</span> MIT-CTP 4399, NT-LBL-12-015, UCB-NPAT-12-013, WUB/12-18 </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys.Lett., B734, 290 (2014) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1206.4527">arXiv:1206.4527</a> <span> [<a href="https://arxiv.org/pdf/1206.4527">pdf</a>, <a href="https://arxiv.org/format/1206.4527">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.86.114509">10.1103/PhysRevD.86.114509 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Nucleon Scalar and Tensor Charges from Lattice QCD with Light Wilson Quarks </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-lat?searchtype=author&query=Green%2C+J+R">J. R. Green</a>, <a href="/search/hep-lat?searchtype=author&query=Negele%2C+J+W">J. W. Negele</a>, <a href="/search/hep-lat?searchtype=author&query=Pochinsky%2C+A+V">A. V. Pochinsky</a>, <a href="/search/hep-lat?searchtype=author&query=Syritsyn%2C+S+N">S. N. Syritsyn</a>, <a href="/search/hep-lat?searchtype=author&query=Engelhardt%2C+M">M. Engelhardt</a>, <a href="/search/hep-lat?searchtype=author&query=Krieg%2C+S">S. Krieg</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="1206.4527v4-abstract-short" style="display: inline;"> We present 2+1 flavor Lattice QCD calculations of the nucleon scalar and tensor charges. Using the BMW clover-improved Wilson action with pion masses between 150 and 350 MeV and three source-sink separations between 0.9 and 1.4 fm, we achieve good control over excited-state contamination and extrapolation to the physical pion mass. As a consistency check, we also present results from calculations… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1206.4527v4-abstract-full').style.display = 'inline'; document.getElementById('1206.4527v4-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1206.4527v4-abstract-full" style="display: none;"> We present 2+1 flavor Lattice QCD calculations of the nucleon scalar and tensor charges. Using the BMW clover-improved Wilson action with pion masses between 150 and 350 MeV and three source-sink separations between 0.9 and 1.4 fm, we achieve good control over excited-state contamination and extrapolation to the physical pion mass. As a consistency check, we also present results from calculations using unitary domain wall fermions with pion masses between 300 and 400 MeV, and using domain wall valence quarks and staggered sea quarks with pion masses between 300 and 600 MeV. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1206.4527v4-abstract-full').style.display = 'none'; document.getElementById('1206.4527v4-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 October, 2012; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 20 June, 2012; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> June 2012. </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</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Report number:</span> MIT-CTP 4359; WUB/12-07; UCB-NPAT-12-008; NT-LBL-12-008 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1111.4249">arXiv:1111.4249</a> <span> [<a href="https://arxiv.org/pdf/1111.4249">pdf</a>, <a href="https://arxiv.org/format/1111.4249">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.85.094510">10.1103/PhysRevD.85.094510 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Sivers and Boer-Mulders observables from lattice QCD </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-lat?searchtype=author&query=Musch%2C+B+U">B. U. Musch</a>, <a href="/search/hep-lat?searchtype=author&query=H%C3%A4gler%2C+P">Ph. H盲gler</a>, <a href="/search/hep-lat?searchtype=author&query=Engelhardt%2C+M">M. Engelhardt</a>, <a href="/search/hep-lat?searchtype=author&query=Negele%2C+J+W">J. W. Negele</a>, <a href="/search/hep-lat?searchtype=author&query=Sch%C3%A4fer%2C+A">A. Sch盲fer</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="1111.4249v2-abstract-short" style="display: inline;"> We present a first calculation of transverse momentum dependent nucleon observables in dynamical lattice QCD employing non-local operators with staple-shaped, "process-dependent" Wilson lines. The use of staple-shaped Wilson lines allows us to link lattice simulations to TMD effects determined from experiment, and in particular to access non-universal, naively time-reversal odd TMD observables. We… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1111.4249v2-abstract-full').style.display = 'inline'; document.getElementById('1111.4249v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1111.4249v2-abstract-full" style="display: none;"> We present a first calculation of transverse momentum dependent nucleon observables in dynamical lattice QCD employing non-local operators with staple-shaped, "process-dependent" Wilson lines. The use of staple-shaped Wilson lines allows us to link lattice simulations to TMD effects determined from experiment, and in particular to access non-universal, naively time-reversal odd TMD observables. We present and discuss results for the generalized Sivers and Boer-Mulders transverse momentum shifts for the SIDIS and DY cases. The effect of staple-shaped Wilson lines on T-even observables is studied for the generalized tensor charge and a generalized transverse shift related to the worm gear function g_1T. We emphasize the dependence of these observables on the staple extent and the Collins-Soper evolution parameter. Our numerical calculations use an n_f = 2+1 mixed action scheme with domain wall valence fermions on an Asqtad sea and pion masses 369 MeV as well as 518 MeV. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1111.4249v2-abstract-full').style.display = 'none'; document.getElementById('1111.4249v2-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> 16 July, 2012; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 17 November, 2011; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> November 2011. </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, 13 figures; version accepted by journal. Contains additional section explaining and summarizing the methodology</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Report number:</span> MIT-CTP 4324, JLAB-THY-11-1462 </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys.Rev. D85 (2012) 094510 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1111.0718">arXiv:1111.0718</a> <span> [<a href="https://arxiv.org/pdf/1111.0718">pdf</a>, <a href="https://arxiv.org/format/1111.0718">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"> Quark Contributions to Nucleon Momentum and Spin from Domain Wall fermion calculations </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-lat?searchtype=author&query=Syritsyn%2C+S+N">S. N. Syritsyn</a>, <a href="/search/hep-lat?searchtype=author&query=Green%2C+J+R">J. R. Green</a>, <a href="/search/hep-lat?searchtype=author&query=Negele%2C+J+W">J. W. Negele</a>, <a href="/search/hep-lat?searchtype=author&query=Pochinsky%2C+A+V">A. V. Pochinsky</a>, <a href="/search/hep-lat?searchtype=author&query=Engelhardt%2C+M">M. Engelhardt</a>, <a href="/search/hep-lat?searchtype=author&query=Hagler%2C+P">Ph. Hagler</a>, <a href="/search/hep-lat?searchtype=author&query=Musch%2C+B">B. Musch</a>, <a href="/search/hep-lat?searchtype=author&query=Schroers%2C+W">W. Schroers</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="1111.0718v2-abstract-short" style="display: inline;"> We report contributions to the nucleon spin and momentum from light quarks calculated using dynamical domain wall fermions with pion masses down to 300 MeV and fine lattice spacing a=0.084 fm. Albeit without disconnected diagrams, we observe that spin and orbital angular momenta of both u and d quarks are opposite, almost canceling in the case of the d quark, which agrees with previous calculation… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1111.0718v2-abstract-full').style.display = 'inline'; document.getElementById('1111.0718v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1111.0718v2-abstract-full" style="display: none;"> We report contributions to the nucleon spin and momentum from light quarks calculated using dynamical domain wall fermions with pion masses down to 300 MeV and fine lattice spacing a=0.084 fm. Albeit without disconnected diagrams, we observe that spin and orbital angular momenta of both u and d quarks are opposite, almost canceling in the case of the d quark, which agrees with previous calculations using a mixed quark action. We also present the full momentum dependence of n=2 generalized form factors showing little variation with the pion mass. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1111.0718v2-abstract-full').style.display = 'none'; document.getElementById('1111.0718v2-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 November, 2011; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 2 November, 2011; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> November 2011. </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, 5 figures, NT-LBNL-11-020, MIT-CTP-4323. Presented at the 29th International Symposium on Lattice Field Theory (Lattice 2011), Squaw Valley, California, 10-16 Jul 2011</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1106.6000">arXiv:1106.6000</a> <span> [<a href="https://arxiv.org/pdf/1106.6000">pdf</a>, <a href="https://arxiv.org/ps/1106.6000">ps</a>, <a href="https://arxiv.org/format/1106.6000">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/PhysRevLett.107.141601">10.1103/PhysRevLett.107.141601 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> The $螖(1232)$ axial charge and 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=Gregory%2C+E+B">E. B. Gregory</a>, <a href="/search/hep-lat?searchtype=author&query=Korzec%2C+T">T. Korzec</a>, <a href="/search/hep-lat?searchtype=author&query=Koutsou%2C+G">G. Koutsou</a>, <a href="/search/hep-lat?searchtype=author&query=Negele%2C+J+W">J. W. Negele</a>, <a href="/search/hep-lat?searchtype=author&query=Sato%2C+T">T. Sato</a>, <a href="/search/hep-lat?searchtype=author&query=Tsapalis%2C+A">A. Tsapalis</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="1106.6000v1-abstract-short" style="display: inline;"> We present the first calculation on the $螖$ axial-vector and pseudoscalar form factors using lattice QCD. Two Goldberger-Treiman relations are derived and examined. A combined chiral fit is performed to the nucleon axial charge, N to $螖$ axial transition coupling constant and $螖$ axial charge. </span> <span class="abstract-full has-text-grey-dark mathjax" id="1106.6000v1-abstract-full" style="display: none;"> We present the first calculation on the $螖$ axial-vector and pseudoscalar form factors using lattice QCD. Two Goldberger-Treiman relations are derived and examined. A combined chiral fit is performed to the nucleon axial charge, N to $螖$ axial transition coupling constant and $螖$ axial charge. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1106.6000v1-abstract-full').style.display = 'none'; document.getElementById('1106.6000v1-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 June, 2011; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> June 2011. </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">5 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/1011.3233">arXiv:1011.3233</a> <span> [<a href="https://arxiv.org/pdf/1011.3233">pdf</a>, <a href="https://arxiv.org/format/1011.3233">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.83.014501">10.1103/PhysRevD.83.014501 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Nucleon to Delta transition form factors with $N_F=2+1$ domain wall 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=Koutsou%2C+G">G. Koutsou</a>, <a href="/search/hep-lat?searchtype=author&query=Negele%2C+J+W">J. W. Negele</a>, <a href="/search/hep-lat?searchtype=author&query=Proestos%2C+Y">Y. Proestos</a>, <a href="/search/hep-lat?searchtype=author&query=Tsapalis%2C+A">A. Tsapalis</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="1011.3233v1-abstract-short" style="display: inline;"> We calculate the electromagnetic, axial and pseudo-scalar form factors of the Nucleon to $螖(1232)$ transition using two dynamical light degenerate quarks and a dynamical strange quark simulated with the domain wall fermion action. Results are obtained at lattice spacings $a = 0.114$ fm and $a=0.084$ fm, with corresponding pion masses of $330$ MeV and $297$ MeV, respectively. High statistics measur… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1011.3233v1-abstract-full').style.display = 'inline'; document.getElementById('1011.3233v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1011.3233v1-abstract-full" style="display: none;"> We calculate the electromagnetic, axial and pseudo-scalar form factors of the Nucleon to $螖(1232)$ transition using two dynamical light degenerate quarks and a dynamical strange quark simulated with the domain wall fermion action. Results are obtained at lattice spacings $a = 0.114$ fm and $a=0.084$ fm, with corresponding pion masses of $330$ MeV and $297$ MeV, respectively. High statistics measurements are achieved by utilizing the coherent sink technique. The dominant electromagnetic dipole form factor, the axial form factors and the pseudo-scalar coupling are extracted to a good accuracy. This allows the investigation of the non-diagonal Goldberger-Treiman relation. Particular emphasis is given on the extraction of the sub-dominant electromagnetic quadrupole form factors and their ratio to the dominant dipole form factor, $R_{EM}$ and $R_{SM}$, measured in experiment. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1011.3233v1-abstract-full').style.display = 'none'; document.getElementById('1011.3233v1-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 November, 2010; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> November 2010. </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">31 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.D83:014501,2011 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1011.1213">arXiv:1011.1213</a> <span> [<a href="https://arxiv.org/pdf/1011.1213">pdf</a>, <a href="https://arxiv.org/format/1011.1213">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.83.094507">10.1103/PhysRevD.83.094507 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Exploring quark transverse momentum distributions with lattice QCD </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-lat?searchtype=author&query=Musch%2C+B+U">Bernhard U. Musch</a>, <a href="/search/hep-lat?searchtype=author&query=H%C3%A4gler%2C+P">Philipp H盲gler</a>, <a href="/search/hep-lat?searchtype=author&query=Negele%2C+J+W">John W. Negele</a>, <a href="/search/hep-lat?searchtype=author&query=Sch%C3%A4fer%2C+A">Andreas Sch盲fer</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="1011.1213v2-abstract-short" style="display: inline;"> We discuss in detail a method to study transverse momentum dependent parton distribution functions (TMDs) using lattice QCD. To develop the formalism and to obtain first numerical results, we directly implement a bi-local quark-quark operator connected by a straight Wilson line, allowing us to study T-even, "process-independent" TMDs. Beyond results for x-integrated TMDs and quark densities, we pr… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1011.1213v2-abstract-full').style.display = 'inline'; document.getElementById('1011.1213v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1011.1213v2-abstract-full" style="display: none;"> We discuss in detail a method to study transverse momentum dependent parton distribution functions (TMDs) using lattice QCD. To develop the formalism and to obtain first numerical results, we directly implement a bi-local quark-quark operator connected by a straight Wilson line, allowing us to study T-even, "process-independent" TMDs. Beyond results for x-integrated TMDs and quark densities, we present a study of correlations in x and transverse momentum. Our calculations are based on domain wall valence quark propagators by the LHP collaboration calculated on top of gauge configurations provided by MILC with 2+1 flavors of asqtad-improved staggered sea quarks. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1011.1213v2-abstract-full').style.display = 'none'; document.getElementById('1011.1213v2-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> 16 July, 2012; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 4 November, 2010; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> November 2010. </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">36 pages, 24 figures; revised version of May 2011, one appendix added</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Report number:</span> MIT-CTP 4178, JLAB-THY-10-1266 </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys.Rev.D83:094507,2011 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1006.0558">arXiv:1006.0558</a> <span> [<a href="https://arxiv.org/pdf/1006.0558">pdf</a>, <a href="https://arxiv.org/format/1006.0558">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.82.034504">10.1103/PhysRevD.82.034504 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> The electromagnetic form factors of the Omega 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=Korzec%2C+T">T. Korzec</a>, <a href="/search/hep-lat?searchtype=author&query=Koutsou%2C+G">G. Koutsou</a>, <a href="/search/hep-lat?searchtype=author&query=Negele%2C+J+W">J. W. Negele</a>, <a href="/search/hep-lat?searchtype=author&query=Proestos%2C+Y">Y. Proestos</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="1006.0558v1-abstract-short" style="display: inline;"> We present results on the Omega baryon electromagnetic form factors using $N_f=2+1$ domain-wall fermion configurations for three pion masses in the range of about 350 to 300 MeV. We compare results obtained using domain wall fermions with those of a mixed-action (hybrid) approach, which combine domain wall valence quarks on staggered sea quarks, for a pion mass of about 350 MeV. We pay particular… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1006.0558v1-abstract-full').style.display = 'inline'; document.getElementById('1006.0558v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1006.0558v1-abstract-full" style="display: none;"> We present results on the Omega baryon electromagnetic form factors using $N_f=2+1$ domain-wall fermion configurations for three pion masses in the range of about 350 to 300 MeV. We compare results obtained using domain wall fermions with those of a mixed-action (hybrid) approach, which combine domain wall valence quarks on staggered sea quarks, for a pion mass of about 350 MeV. We pay particular attention in the evaluation of the subdominant electric quadrupole form factor to sufficient accuracy to exclude a zero value, by constructing a sequential source that isolates it from the dominant form factors. The $惟^-$ magnetic moment, $渭_{惟^{-}}$, the electric charge and magnetic radius, $\langle r^{2}_{E0/M1} \rangle$, are extracted for these pion masses. The electric quadrupole moment is determined for the first time using dynamical quarks. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1006.0558v1-abstract-full').style.display = 'none'; document.getElementById('1006.0558v1-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 June, 2010; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> June 2010. </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">13 pages, 10 Figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Report number:</span> HU-EP-10/27; SFB/CPP-10-42 </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys.Rev.D82:034504,2010 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1002.3550">arXiv:1002.3550</a> <span> [<a href="https://arxiv.org/pdf/1002.3550">pdf</a>, <a href="https://arxiv.org/ps/1002.3550">ps</a>, <a href="https://arxiv.org/format/1002.3550">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 electromagnetic form factors with 2+1 flavors of domain wall fermions </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-lat?searchtype=author&query=Lin%2C+M+F">M. F. Lin</a>, <a href="/search/hep-lat?searchtype=author&query=Bratt%2C+J+D">J. D. Bratt</a>, <a href="/search/hep-lat?searchtype=author&query=Engelhardt%2C+M">M. Engelhardt</a>, <a href="/search/hep-lat?searchtype=author&query=Hagler%2C+P">Ph. Hagler</a>, <a href="/search/hep-lat?searchtype=author&query=Hemmert%2C+T+R">T. R. Hemmert</a>, <a href="/search/hep-lat?searchtype=author&query=Meyer%2C+H+B">H. B. Meyer</a>, <a href="/search/hep-lat?searchtype=author&query=Negele%2C+J+W">J. W. Negele</a>, <a href="/search/hep-lat?searchtype=author&query=Pochinsky%2C+A+V">A. V. Pochinsky</a>, <a href="/search/hep-lat?searchtype=author&query=Procura%2C+M">M. Procura</a>, <a href="/search/hep-lat?searchtype=author&query=Schroers%2C+W">W. Schroers</a>, <a href="/search/hep-lat?searchtype=author&query=Syritsyn%2C+S">S. Syritsyn</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="1002.3550v1-abstract-short" style="display: inline;"> We present the recent high-statistics calculations of the nucleon electromagnetic form factors with fully dynamical domain wall fermions on the 32^3x64 lattices generated by the RBC and UKQCD collaborations, with pion masses at roughly 297 MeV, 355 MeV and 403 MeV. We study the phenomenological fits to the momentum transfer dependence of the form factors and investigate chiral extrapolations for… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1002.3550v1-abstract-full').style.display = 'inline'; document.getElementById('1002.3550v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1002.3550v1-abstract-full" style="display: none;"> We present the recent high-statistics calculations of the nucleon electromagnetic form factors with fully dynamical domain wall fermions on the 32^3x64 lattices generated by the RBC and UKQCD collaborations, with pion masses at roughly 297 MeV, 355 MeV and 403 MeV. We study the phenomenological fits to the momentum transfer dependence of the form factors and investigate chiral extrapolations for the Dirac radius, Pauli radius and the anomalous magnetic moment using two variants of chiral effective field theories, the small scale expansion (SSE) and covariant baryon chiral perturbation theory. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1002.3550v1-abstract-full').style.display = 'none'; document.getElementById('1002.3550v1-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 February, 2010; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> February 2010. </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 the XXVII International Symposium on Lattice Field Theory, Beijing, China, July 26-31, 2009. 8 pages, 9 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> PoS(LAT2009)127 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1001.3620">arXiv:1001.3620</a> <span> [<a href="https://arxiv.org/pdf/1001.3620">pdf</a>, <a href="https://arxiv.org/format/1001.3620">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.82.094502">10.1103/PhysRevD.82.094502 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Nucleon structure from mixed action calculations using 2+1 flavors of asqtad sea and domain wall valence fermions </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-lat?searchtype=author&query=LHPC+Collaboration"> LHPC Collaboration</a>, <a href="/search/hep-lat?searchtype=author&query=Bratt%2C+J+D">Jonathan D. Bratt</a>, <a href="/search/hep-lat?searchtype=author&query=Edwards%2C+R+G">Robert G. Edwards</a>, <a href="/search/hep-lat?searchtype=author&query=Engelhardt%2C+M">Michael Engelhardt</a>, <a href="/search/hep-lat?searchtype=author&query=Hagler%2C+P">Philipp Hagler</a>, <a href="/search/hep-lat?searchtype=author&query=Lin%2C+H">Huey-Wen Lin</a>, <a href="/search/hep-lat?searchtype=author&query=Lin%2C+M">Mei-Feng Lin</a>, <a href="/search/hep-lat?searchtype=author&query=Meyer%2C+H+B">Harvey B. Meyer</a>, <a href="/search/hep-lat?searchtype=author&query=Musch%2C+B">Bernhard Musch</a>, <a href="/search/hep-lat?searchtype=author&query=Negele%2C+J+W">John W. Negele</a>, <a href="/search/hep-lat?searchtype=author&query=Orginos%2C+K">Kostas Orginos</a>, <a href="/search/hep-lat?searchtype=author&query=Pochinsky%2C+A+V">Andrew V. Pochinsky</a>, <a href="/search/hep-lat?searchtype=author&query=Procura%2C+M">Massimiliano Procura</a>, <a href="/search/hep-lat?searchtype=author&query=Richards%2C+D+G">David G. Richards</a>, <a href="/search/hep-lat?searchtype=author&query=Schroers%2C+W">Wolfram Schroers</a>, <a href="/search/hep-lat?searchtype=author&query=Syritsyn%2C+S+N">Sergey N. Syritsyn</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="1001.3620v2-abstract-short" style="display: inline;"> We present high statistics results for the structure of the nucleon from a mixed-action calculation using 2+1 flavors of asqtad sea and domain wall valence fermions. We perform extrapolations of our data based on different chiral effective field theory schemes and compare our results with available information from phenomenology. We discuss vector and axial form factors of the nucleon, moments of… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1001.3620v2-abstract-full').style.display = 'inline'; document.getElementById('1001.3620v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1001.3620v2-abstract-full" style="display: none;"> We present high statistics results for the structure of the nucleon from a mixed-action calculation using 2+1 flavors of asqtad sea and domain wall valence fermions. We perform extrapolations of our data based on different chiral effective field theory schemes and compare our results with available information from phenomenology. We discuss vector and axial form factors of the nucleon, moments of generalized parton distributions, including moments of forward parton distributions, and implications for the decomposition of the nucleon spin. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1001.3620v2-abstract-full').style.display = 'none'; document.getElementById('1001.3620v2-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 August, 2010; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 20 January, 2010; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> January 2010. </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">68 pages, 47 figures. Main revision points: improved discussion of chiral fits and systematic uncertainties, several minor refinements. Accepted for publication in Phys.Rev. D</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Report number:</span> TUM/T39-10-01, TUM-EFT 6/10, CERN-PH-TH/2010-005 </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys.Rev.D82:094502,2010 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/0912.0394">arXiv:0912.0394</a> <span> [<a href="https://arxiv.org/pdf/0912.0394">pdf</a>, <a href="https://arxiv.org/ps/0912.0394">ps</a>, <a href="https://arxiv.org/format/0912.0394">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.80.099901">10.1103/PhysRevD.80.099901 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Axial Nucleon to Delta transition form factors on 2+1 flavor hybrid lattices </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=Koutsou%2C+G">G. Koutsou</a>, <a href="/search/hep-lat?searchtype=author&query=Leontiou%2C+T">Th. Leontiou</a>, <a href="/search/hep-lat?searchtype=author&query=Negele%2C+J+W">J. W. Negele</a>, <a href="/search/hep-lat?searchtype=author&query=Tsapalis%2C+A">A. Tsapalis</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="0912.0394v1-abstract-short" style="display: inline;"> We correct the values of the dominant nucleon to Delta axial transition form factors CA_5 and CA_6 published in C. Alexandrou et.al., Phys. Rev. D 76,094511 (2007). The analysis error affects only the values obtained when using the hybrid action in the low Q^2 regime bringing them into agreement with those obtained with Wilson fermions. </span> <span class="abstract-full has-text-grey-dark mathjax" id="0912.0394v1-abstract-full" style="display: none;"> We correct the values of the dominant nucleon to Delta axial transition form factors CA_5 and CA_6 published in C. Alexandrou et.al., Phys. Rev. D 76,094511 (2007). The analysis error affects only the values obtained when using the hybrid action in the low Q^2 regime bringing them into agreement with those obtained with Wilson fermions. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('0912.0394v1-abstract-full').style.display = 'none'; document.getElementById('0912.0394v1-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 December, 2009; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> December 2009. </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">1+2 pages, 2 figures, 1 Table, Erratum to C. Alexandrou et.al., Phys. Rev. D 76, 094511 (2007)</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. D 80, 099901 (E) (2009) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/0910.5617">arXiv:0910.5617</a> <span> [<a href="https://arxiv.org/pdf/0910.5617">pdf</a>, <a href="https://arxiv.org/ps/0910.5617">ps</a>, <a href="https://arxiv.org/format/0910.5617">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"> N to Delta transition form factors with Nf=2+1 domain wall 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=Koutsou%2C+G">G. Koutsou</a>, <a href="/search/hep-lat?searchtype=author&query=Negele%2C+J+W">J. W. Negele</a>, <a href="/search/hep-lat?searchtype=author&query=O%27Cais%2C+A">A. O'Cais</a>, <a href="/search/hep-lat?searchtype=author&query=Proestos%2C+Y">Y. Proestos</a>, <a href="/search/hep-lat?searchtype=author&query=Tsapalis%2C+A">A. Tsapalis</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="0910.5617v1-abstract-short" style="display: inline;"> The electromagnetic, axial and pseudoscalar nucleon to Delta form factors are calculated using dynamical domain wall fermions at a lattice spacing of a = 0.114 fm on a lattice of spatial size 2.74 fm and pion mass of 331 MeV. Pion pole dominance and the Goldberger-Treiman relations are examined. </span> <span class="abstract-full has-text-grey-dark mathjax" id="0910.5617v1-abstract-full" style="display: none;"> The electromagnetic, axial and pseudoscalar nucleon to Delta form factors are calculated using dynamical domain wall fermions at a lattice spacing of a = 0.114 fm on a lattice of spatial size 2.74 fm and pion mass of 331 MeV. Pion pole dominance and the Goldberger-Treiman relations are examined. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('0910.5617v1-abstract-full').style.display = 'none'; document.getElementById('0910.5617v1-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 October, 2009; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> October 2009. </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">8 pages, 8 figures, Presented at the XXVII International Symposium on Lattice Field Theory, LATTICE 2009, July 26-31, 2009, Peking University, Beijing, China</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> PoS LAT2009:156,2009 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/0910.3816">arXiv:0910.3816</a> <span> [<a href="https://arxiv.org/pdf/0910.3816">pdf</a>, <a href="https://arxiv.org/ps/0910.3816">ps</a>, <a href="https://arxiv.org/format/0910.3816">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 high statistics mixed-action calculations with 2+1 flavors </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-lat?searchtype=author&query=LHPC+Collaboration"> LHPC Collaboration</a>, <a href="/search/hep-lat?searchtype=author&query=Schroers%2C+W">Wolfram Schroers</a>, <a href="/search/hep-lat?searchtype=author&query=Bratt%2C+J+D">Jonathan D. Bratt</a>, <a href="/search/hep-lat?searchtype=author&query=Edwards%2C+R+G">Robert G. Edwards</a>, <a href="/search/hep-lat?searchtype=author&query=Engelhardt%2C+M">Michael Engelhardt</a>, <a href="/search/hep-lat?searchtype=author&query=Fleming%2C+G+T">George Taminga Fleming</a>, <a href="/search/hep-lat?searchtype=author&query=Hagler%2C+P">Philipp Hagler</a>, <a href="/search/hep-lat?searchtype=author&query=Lin%2C+H">Huey-Wen Lin</a>, <a href="/search/hep-lat?searchtype=author&query=Lin%2C+M">Mei-Feng Lin</a>, <a href="/search/hep-lat?searchtype=author&query=Meyer%2C+H+B">Harvey B. Meyer</a>, <a href="/search/hep-lat?searchtype=author&query=Musch%2C+B">Bernhard Musch</a>, <a href="/search/hep-lat?searchtype=author&query=Negele%2C+J+W">John W. Negele</a>, <a href="/search/hep-lat?searchtype=author&query=Orginos%2C+K">Kostas Orginos</a>, <a href="/search/hep-lat?searchtype=author&query=Pochinsky%2C+A+V">Andrew V. Pochinsky</a>, <a href="/search/hep-lat?searchtype=author&query=Procura%2C+M">Massimiliano Procura</a>, <a href="/search/hep-lat?searchtype=author&query=Renner%2C+D+B">Dru B. Renner</a>, <a href="/search/hep-lat?searchtype=author&query=Richards%2C+D+G">David G. Richards</a>, <a href="/search/hep-lat?searchtype=author&query=Syritsyn%2C+S+N">Sergey N. Syritsyn</a>, <a href="/search/hep-lat?searchtype=author&query=Walker-Loud%2C+A+P">Andre P. Walker-Loud</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="0910.3816v1-abstract-short" style="display: inline;"> We present new high-statistics results for nucleon form factors at pion masses of approximately 290, 350, 500, and 600 MeV using a mixed action of domain wall valence quarks on an improved staggered sea. We perform chiral fits to both vector and axial form factors and compare our results to experiment. </span> <span class="abstract-full has-text-grey-dark mathjax" id="0910.3816v1-abstract-full" style="display: none;"> We present new high-statistics results for nucleon form factors at pion masses of approximately 290, 350, 500, and 600 MeV using a mixed action of domain wall valence quarks on an improved staggered sea. We perform chiral fits to both vector and axial form factors and compare our results to experiment. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('0910.3816v1-abstract-full').style.display = 'none'; document.getElementById('0910.3816v1-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 October, 2009; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> October 2009. </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; contribution to the proceedings of the XXVII International Symposium on Lattice Field Theory - LAT2009, July 26-31, 2009, Peking University, Beijing, China. To appear as PoS(LAT2009)142</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> PoS LAT2009:142,2009 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/0910.3315">arXiv:0910.3315</a> <span> [<a href="https://arxiv.org/pdf/0910.3315">pdf</a>, <a href="https://arxiv.org/ps/0910.3315">ps</a>, <a href="https://arxiv.org/format/0910.3315">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> <p class="title is-5 mathjax"> Delta electromagnetic form factors and quark transverse charge densities 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=Korzec%2C+T">T. Korzec</a>, <a href="/search/hep-lat?searchtype=author&query=Koutsou%2C+G">G. Koutsou</a>, <a href="/search/hep-lat?searchtype=author&query=Lorc%C3%A9%2C+C">C. Lorc茅</a>, <a href="/search/hep-lat?searchtype=author&query=Pascalutsa%2C+V">V. Pascalutsa</a>, <a href="/search/hep-lat?searchtype=author&query=Vanderhaeghen%2C+M">M. Vanderhaeghen</a>, <a href="/search/hep-lat?searchtype=author&query=Negele%2C+J+W">J. W. Negele</a>, <a href="/search/hep-lat?searchtype=author&query=Tsapalis%2C+A">A. Tsapalis</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="0910.3315v1-abstract-short" style="display: inline;"> We discuss the techniques to extract the electromagnetic Delta form factors in Lattice QCD. We evaluate these form factors using dynamical fermions with smallest pion mass of about 350 MeV. We pay particular attention to the extraction of the electric quadrupole form factor that signals a deformation of the Delta. The magnetic moment of the $螖$ is extrapolated using a chiral effective field theo… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('0910.3315v1-abstract-full').style.display = 'inline'; document.getElementById('0910.3315v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="0910.3315v1-abstract-full" style="display: none;"> We discuss the techniques to extract the electromagnetic Delta form factors in Lattice QCD. We evaluate these form factors using dynamical fermions with smallest pion mass of about 350 MeV. We pay particular attention to the extraction of the electric quadrupole form factor that signals a deformation of the Delta. The magnetic moment of the $螖$ is extrapolated using a chiral effective field theory. Using the form factors we evaluate the transverse density distributions in the infinite momentum frame showing deformation in the Delta. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('0910.3315v1-abstract-full').style.display = 'none'; document.getElementById('0910.3315v1-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 October, 2009; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> October 2009. </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, Invited Talk at the 6th International Workshop on Chiral Dynamics, CD09, July 6-10, 2009, Bern, Switzerland</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> PoS CD09:092,2009 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/0908.1283">arXiv:0908.1283</a> <span> [<a href="https://arxiv.org/pdf/0908.1283">pdf</a>, <a href="https://arxiv.org/format/0908.1283">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/10.1209/0295-5075/88/61001">10.1209/0295-5075/88/61001 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Intrinsic quark transverse momentum in the nucleon from lattice QCD </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-lat?searchtype=author&query=H%C3%A4gler%2C+P">Ph. H盲gler</a>, <a href="/search/hep-lat?searchtype=author&query=Musch%2C+B+U">B. U. Musch</a>, <a href="/search/hep-lat?searchtype=author&query=Negele%2C+J+W">J. W. Negele</a>, <a href="/search/hep-lat?searchtype=author&query=Sch%C3%A4fer%2C+A">A. Sch盲fer</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="0908.1283v1-abstract-short" style="display: inline;"> A better understanding of transverse momentum (k_T-) dependent quark distributions in a hadron is needed to interpret several experimentally observed large angular asymmetries and to clarify the fundamental role of gauge links in non-abelian gauge theories. Based on manifestly non-local gauge invariant quark operators we introduce process-independent k_T-distributions and study their properties… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('0908.1283v1-abstract-full').style.display = 'inline'; document.getElementById('0908.1283v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="0908.1283v1-abstract-full" style="display: none;"> A better understanding of transverse momentum (k_T-) dependent quark distributions in a hadron is needed to interpret several experimentally observed large angular asymmetries and to clarify the fundamental role of gauge links in non-abelian gauge theories. Based on manifestly non-local gauge invariant quark operators we introduce process-independent k_T-distributions and study their properties in lattice QCD. We find that the longitudinal and transverse momentum dependence approximately factorizes, in contrast to the behavior of generalized parton distributions. The resulting quark k_T-probability densities for the nucleon show characteristic dipole deformations due to correlations between intrinsic k_T and the quark or nucleon spin. Our lattice calculations are based on N_f=2+1 mixed action propagators of the LHP collaboration. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('0908.1283v1-abstract-full').style.display = 'none'; document.getElementById('0908.1283v1-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> 10 August, 2009; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> August 2009. </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">4 pages, 3 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Report number:</span> TUM/T39-09-08, MIT-CTP 4056 </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Europhys.Lett.88:61001,2009 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/0907.4194">arXiv:0907.4194</a> <span> [<a href="https://arxiv.org/pdf/0907.4194">pdf</a>, <a href="https://arxiv.org/ps/0907.4194">ps</a>, <a href="https://arxiv.org/format/0907.4194">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.81.034507">10.1103/PhysRevD.81.034507 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Nucleon Electromagnetic Form Factors from Lattice QCD using 2+1 Flavor Domain Wall Fermions on Fine Lattices and Chiral Perturbation Theory </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-lat?searchtype=author&query=Syritsyn%2C+S+N">S. N. Syritsyn</a>, <a href="/search/hep-lat?searchtype=author&query=Bratt%2C+J+D">J. D. Bratt</a>, <a href="/search/hep-lat?searchtype=author&query=Lin%2C+M+F">M. F. Lin</a>, <a href="/search/hep-lat?searchtype=author&query=Meyer%2C+H+B">H. B. Meyer</a>, <a href="/search/hep-lat?searchtype=author&query=Negele%2C+J+W">J. W. Negele</a>, <a href="/search/hep-lat?searchtype=author&query=Pochinsky%2C+A+V">A. V. Pochinsky</a>, <a href="/search/hep-lat?searchtype=author&query=Procura%2C+M">M. Procura</a>, <a href="/search/hep-lat?searchtype=author&query=Engelhardt%2C+M">M. Engelhardt</a>, <a href="/search/hep-lat?searchtype=author&query=Hagler%2C+P">Ph. Hagler</a>, <a href="/search/hep-lat?searchtype=author&query=Hemmert%2C+T+R">T. R. Hemmert</a>, <a href="/search/hep-lat?searchtype=author&query=Schroers%2C+W">W. Schroers</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="0907.4194v1-abstract-short" style="display: inline;"> We present a high-statistics calculation of nucleon electromagnetic form factors in $N_f=2+1$ lattice QCD using domain wall quarks on fine lattices, to attain a new level of precision in systematic and statistical errors. Our calculations use $32^3 \times 64$ lattices with lattice spacing a=0.084 fm for pion masses of 297, 355, and 403 MeV, and we perform an overdetermined analysis using on the… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('0907.4194v1-abstract-full').style.display = 'inline'; document.getElementById('0907.4194v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="0907.4194v1-abstract-full" style="display: none;"> We present a high-statistics calculation of nucleon electromagnetic form factors in $N_f=2+1$ lattice QCD using domain wall quarks on fine lattices, to attain a new level of precision in systematic and statistical errors. Our calculations use $32^3 \times 64$ lattices with lattice spacing a=0.084 fm for pion masses of 297, 355, and 403 MeV, and we perform an overdetermined analysis using on the order of 3600 to 7000 measurements to calculate nucleon electric and magnetic form factors up to $Q^2 \approx$ 1.05 GeV$^2$. Results are shown to be consistent with those obtained using valence domain wall quarks with improved staggered sea quarks, and using coarse domain wall lattices. We determine the isovector Dirac radius $r_1^v$, Pauli radius $r_2^v$ and anomalous magnetic moment $魏_v$. We also determine connected contributions to the corresponding isoscalar observables. We extrapolate these observables to the physical pion mass using two different formulations of two-flavor chiral effective field theory at one loop: the heavy baryon Small Scale Expansion (SSE) and covariant baryon chiral perturbation theory. The isovector results and the connected contributions to the isoscalar results are compared with experiment, and the need for calculations at smaller pion masses is discussed. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('0907.4194v1-abstract-full').style.display = 'none'; document.getElementById('0907.4194v1-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 July, 2009; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> July 2009. </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">44 pages, 40 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Report number:</span> MIT-CTP-4032 </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys.Rev.D81:034507,2010 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/0907.0529">arXiv:0907.0529</a> <span> [<a href="https://arxiv.org/pdf/0907.0529">pdf</a>, <a href="https://arxiv.org/ps/0907.0529">ps</a>, <a href="https://arxiv.org/format/0907.0529">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.81.014502">10.1103/PhysRevD.81.014502 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> A Lattice Test of 1/N_c Baryon Mass Relations </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-lat?searchtype=author&query=Jenkins%2C+E+E">Elizabeth Ellen Jenkins</a>, <a href="/search/hep-lat?searchtype=author&query=Manohar%2C+A+V">Aneesh V. Manohar</a>, <a href="/search/hep-lat?searchtype=author&query=Negele%2C+J+W">John W. Negele</a>, <a href="/search/hep-lat?searchtype=author&query=Walker-Loud%2C+A">Andre Walker-Loud</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="0907.0529v2-abstract-short" style="display: inline;"> 1/N_c baryon mass relations are compared with lattice simulations of baryon masses using different values of the light-quark masses, and hence different values of SU(3) flavor-symmetry breaking. The lattice data clearly display both the 1/N_c and SU(3) flavor-symmetry breaking hierarchies. The validity of 1/N_c baryon mass relations derived without assuming approximate SU(3) flavor-symmetry also… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('0907.0529v2-abstract-full').style.display = 'inline'; document.getElementById('0907.0529v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="0907.0529v2-abstract-full" style="display: none;"> 1/N_c baryon mass relations are compared with lattice simulations of baryon masses using different values of the light-quark masses, and hence different values of SU(3) flavor-symmetry breaking. The lattice data clearly display both the 1/N_c and SU(3) flavor-symmetry breaking hierarchies. The validity of 1/N_c baryon mass relations derived without assuming approximate SU(3) flavor-symmetry also can be tested by lattice data at very large values of the strange quark mass. The 1/N_c expansion constrains the form of discretization effects; these are suppressed by powers of 1/N_c by taking suitable combinations of masses. This 1/N_c scaling is explicitly demonstrated in the present work. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('0907.0529v2-abstract-full').style.display = 'none'; document.getElementById('0907.0529v2-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 December, 2009; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 3 July, 2009; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> July 2009. </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">13 pages, 20 figures; v2 version to be published 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.D81:014502,2010 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/0903.3063">arXiv:0903.3063</a> <span> [<a href="https://arxiv.org/pdf/0903.3063">pdf</a>, <a href="https://arxiv.org/ps/0903.3063">ps</a>, <a href="https://arxiv.org/format/0903.3063">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 Structure with Domain Wall Fermions at a = 0.084 fm </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-lat?searchtype=author&query=Syritsyn%2C+S+N">S. N. Syritsyn</a>, <a href="/search/hep-lat?searchtype=author&query=Bratt%2C+J+D">J. D. Bratt</a>, <a href="/search/hep-lat?searchtype=author&query=Lin%2C+M+F">M. F. Lin</a>, <a href="/search/hep-lat?searchtype=author&query=Meyer%2C+H+B">H. B. Meyer</a>, <a href="/search/hep-lat?searchtype=author&query=Negele%2C+J+W">J. W. Negele</a>, <a href="/search/hep-lat?searchtype=author&query=Pochinsky%2C+A+V">A. V. Pochinsky</a>, <a href="/search/hep-lat?searchtype=author&query=Procura%2C+M">M. Procura</a>, <a href="/search/hep-lat?searchtype=author&query=Edwards%2C+R+G">R. G. Edwards</a>, <a href="/search/hep-lat?searchtype=author&query=Orginos%2C+K">K. Orginos</a>, <a href="/search/hep-lat?searchtype=author&query=Richards%2C+D+G">D. G. Richards</a>, <a href="/search/hep-lat?searchtype=author&query=Engelhardt%2C+M">M. Engelhardt</a>, <a href="/search/hep-lat?searchtype=author&query=Fleming%2C+G+T">G. T. Fleming</a>, <a href="/search/hep-lat?searchtype=author&query=H%C3%A4gler%2C+P">Ph. H盲gler</a>, <a href="/search/hep-lat?searchtype=author&query=Musch%2C+B">B. Musch</a>, <a href="/search/hep-lat?searchtype=author&query=Renner%2C+D+B">D. B. Renner</a>, <a href="/search/hep-lat?searchtype=author&query=Schroers%2C+W">W. Schroers</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="0903.3063v1-abstract-short" style="display: inline;"> We present initial calculations of nucleon matrix elements of twist-two operators with 2+1 flavors of domain wall fermions at a lattice spacing a = 0.084 fm for pion masses down to 300 MeV. We also compare the results with the domain wall calculations on a coarser lattice. </span> <span class="abstract-full has-text-grey-dark mathjax" id="0903.3063v1-abstract-full" style="display: none;"> We present initial calculations of nucleon matrix elements of twist-two operators with 2+1 flavors of domain wall fermions at a lattice spacing a = 0.084 fm for pion masses down to 300 MeV. We also compare the results with the domain wall calculations on a coarser lattice. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('0903.3063v1-abstract-full').style.display = 'none'; document.getElementById('0903.3063v1-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 March, 2009; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> March 2009. </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, 10 figures. Talks presented at the XXVI International Symposium on Lattice Field Theory, July 14 - 19 2008, Williamsburg, Virginia, USA</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> PoS LATTICE2008:169,2008 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/0901.3457">arXiv:0901.3457</a> <span> [<a href="https://arxiv.org/pdf/0901.3457">pdf</a>, <a href="https://arxiv.org/ps/0901.3457">ps</a>, <a href="https://arxiv.org/format/0901.3457">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 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/10.1016/j.nuclphysa.2009.04.005">10.1016/j.nuclphysa.2009.04.005 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Quark transverse charge densities in the $螖(1232)$ 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=Korzec%2C+T">Tomasz Korzec</a>, <a href="/search/hep-lat?searchtype=author&query=Koutsou%2C+G">Giannis Koutsou</a>, <a href="/search/hep-lat?searchtype=author&query=Lorc%C3%A9%2C+C">C茅dric Lorc茅</a>, <a href="/search/hep-lat?searchtype=author&query=Negele%2C+J+W">John W. Negele</a>, <a href="/search/hep-lat?searchtype=author&query=Pascalutsa%2C+V">Vladimir Pascalutsa</a>, <a href="/search/hep-lat?searchtype=author&query=Tsapalis%2C+A">Antonios Tsapalis</a>, <a href="/search/hep-lat?searchtype=author&query=Vanderhaeghen%2C+M">Marc Vanderhaeghen</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="0901.3457v1-abstract-short" style="display: inline;"> We extend the formalism relating electromagnetic form factors to transverse quark charge densities in the light-front frame to the case of a spin-3/2 baryon and calculate these transverse densities for the $螖(1232)$ isobar using lattice QCD. The transverse charge densities for a transversely polarized spin-3/2 particle are characterized by monopole, dipole, quadrupole, and octupole patterns repr… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('0901.3457v1-abstract-full').style.display = 'inline'; document.getElementById('0901.3457v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="0901.3457v1-abstract-full" style="display: none;"> We extend the formalism relating electromagnetic form factors to transverse quark charge densities in the light-front frame to the case of a spin-3/2 baryon and calculate these transverse densities for the $螖(1232)$ isobar using lattice QCD. The transverse charge densities for a transversely polarized spin-3/2 particle are characterized by monopole, dipole, quadrupole, and octupole patterns representing the structure beyond that of a pure point-like spin-3/2 particle. We present lattice QCD results for the $螖$-isobar electromagnetic form factors for pion masses down to approximatively 350 MeV for three cases: quenched QCD, two-degenerate flavors of dynamical Wilson quarks, and three flavors of quarks using a mixed action that combines domain wall valence quarks and dynamical staggered sea quarks. We extract transverse quark charge densities from these lattice results and find that the $螖$ is prolately deformed, as indicated by the fact that the quadrupole moment $G_{E2}(0$) is larger than the value -3 characterizing a point particle and the fact that the transverse charge density in a $螖^+$ of maximal transverse spin projection is elongated along the axis of the spin. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('0901.3457v1-abstract-full').style.display = 'none'; document.getElementById('0901.3457v1-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 January, 2009; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> January 2009. </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">35 pages, 10 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Nucl.Phys.A825:115-144,2009 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/0811.1536">arXiv:0811.1536</a> <span> [<a href="https://arxiv.org/pdf/0811.1536">pdf</a>, <a href="https://arxiv.org/format/0811.1536">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"> Transverse momentum distributions of quarks in the nucleon from Lattice QCD </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-lat?searchtype=author&query=Musch%2C+B+U">Bernhard U. Musch</a>, <a href="/search/hep-lat?searchtype=author&query=H%C3%A4gler%2C+P">Philipp H盲gler</a>, <a href="/search/hep-lat?searchtype=author&query=Sch%C3%A4fer%2C+A">Andreas Sch盲fer</a>, <a href="/search/hep-lat?searchtype=author&query=Renner%2C+D+B">Dru B. Renner</a>, <a href="/search/hep-lat?searchtype=author&query=Negele%2C+J+W">John W. Negele</a>, <a href="/search/hep-lat?searchtype=author&query=Collaboration%2C+L">LHPC Collaboration</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="0811.1536v1-abstract-short" style="display: inline;"> Transverse momentum dependent parton distribution functions (TMDPDFs) encode information about the intrinsic motion of quarks inside the nucleon. They are important non-perturbative ingredients in our understanding of, e.g., azimuthal asymmetries and other qualitative features in semi-inclusive deep inelastic scattering experiments. We present first calculations on the lattice, based on MILC gau… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('0811.1536v1-abstract-full').style.display = 'inline'; document.getElementById('0811.1536v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="0811.1536v1-abstract-full" style="display: none;"> Transverse momentum dependent parton distribution functions (TMDPDFs) encode information about the intrinsic motion of quarks inside the nucleon. They are important non-perturbative ingredients in our understanding of, e.g., azimuthal asymmetries and other qualitative features in semi-inclusive deep inelastic scattering experiments. We present first calculations on the lattice, based on MILC gauge configurations and propagators from LHPC. They yield polarized and unpolarized transverse momentum dependent quark densities and enable us to test the assumption of factorization in x and transverse momentum. The operators we employ are non-local and contain a Wilson line, whose renormalization requires the removal of a divergence linear in the cutoff 1/a. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('0811.1536v1-abstract-full').style.display = 'none'; document.getElementById('0811.1536v1-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> 10 November, 2008; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> November 2008. </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, 9 figures, submitted as PoS LC2008 053</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Report number:</span> TUM-T39-15 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/0810.3976">arXiv:0810.3976</a> <span> [<a href="https://arxiv.org/pdf/0810.3976">pdf</a>, <a href="https://arxiv.org/ps/0810.3976">ps</a>, <a href="https://arxiv.org/format/0810.3976">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.79.014507">10.1103/PhysRevD.79.014507 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Delta-baryon electromagnetic form factors 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=Korzec%2C+T">T. Korzec</a>, <a href="/search/hep-lat?searchtype=author&query=Koutsou%2C+G">G. Koutsou</a>, <a href="/search/hep-lat?searchtype=author&query=Leontiou%2C+T">Th. Leontiou</a>, <a href="/search/hep-lat?searchtype=author&query=Lorc%C3%A9%2C+C">C. Lorc茅</a>, <a href="/search/hep-lat?searchtype=author&query=Negele%2C+J+W">J. W. Negele</a>, <a href="/search/hep-lat?searchtype=author&query=Pascalutsa%2C+V">V. Pascalutsa</a>, <a href="/search/hep-lat?searchtype=author&query=Tsapalis%2C+A">A. Tsapalis</a>, <a href="/search/hep-lat?searchtype=author&query=Vanderhaeghen%2C+M">M. Vanderhaeghen</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="0810.3976v1-abstract-short" style="display: inline;"> We develop techniques to calculate the four Delta electromagnetic form factors using lattice QCD, with particular emphasis on the sub-dominant electric quadrupole form factor that probes deformation of the Delta. Results are presented for pion masses down to approximately 350 MeV for three cases: quenched QCD, two flavors of dynamical Wilson quarks, and three flavors of quarks described by a mix… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('0810.3976v1-abstract-full').style.display = 'inline'; document.getElementById('0810.3976v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="0810.3976v1-abstract-full" style="display: none;"> We develop techniques to calculate the four Delta electromagnetic form factors using lattice QCD, with particular emphasis on the sub-dominant electric quadrupole form factor that probes deformation of the Delta. Results are presented for pion masses down to approximately 350 MeV for three cases: quenched QCD, two flavors of dynamical Wilson quarks, and three flavors of quarks described by a mixed action combining domain wall valence quarks and dynamical staggered sea quarks. The magnetic moment of the Delta is chirally extrapolated to the physical point and the Delta charge density distributions are discussed. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('0810.3976v1-abstract-full').style.display = 'none'; document.getElementById('0810.3976v1-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 October, 2008; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> October 2008. </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">4 pages, 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.D79:014507,2009 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/0810.1954">arXiv:0810.1954</a> <span> [<a href="https://arxiv.org/pdf/0810.1954">pdf</a>, <a href="https://arxiv.org/format/0810.1954">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"> A Variational Study of the Nucleon Wavefunction </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-lat?searchtype=author&query=Bratt%2C+J">Jonathan Bratt</a>, <a href="/search/hep-lat?searchtype=author&query=Negele%2C+J+W">J. W. Negele</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="0810.1954v1-abstract-short" style="display: inline;"> The structure of the nucleon is studied variationally on the lattice by maximizing the overlap between the nucleon and a trial function generated by an interpolating field containing variational parameters. We examine the effect of the spatial extent of smeared quark sources, the degree of gauge field smearing, the positions of smeared quark sources, inclusion of lower Dirac components and of di… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('0810.1954v1-abstract-full').style.display = 'inline'; document.getElementById('0810.1954v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="0810.1954v1-abstract-full" style="display: none;"> The structure of the nucleon is studied variationally on the lattice by maximizing the overlap between the nucleon and a trial function generated by an interpolating field containing variational parameters. We examine the effect of the spatial extent of smeared quark sources, the degree of gauge field smearing, the positions of smeared quark sources, inclusion of lower Dirac components and of diquark substructure. Exploratory calculations with quenched Wilson fermions at a pion mass of 900 MeV achieved overlaps as high as 80%, and there was no evidence of diquark substructure. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('0810.1954v1-abstract-full').style.display = 'none'; document.getElementById('0810.1954v1-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> 10 October, 2008; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> October 2008. </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, 8 figures; talk presented at the XXVI International Symposium on Lattice Field Theory, July 14 - 19, 2008, Williamsburg, Virginia, USA</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Report number:</span> MIT-CTP 3992 </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> PoS LATTICE2008:153,2008 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/0810.1933">arXiv:0810.1933</a> <span> [<a href="https://arxiv.org/pdf/0810.1933">pdf</a>, <a href="https://arxiv.org/ps/0810.1933">ps</a>, <a href="https://arxiv.org/format/0810.1933">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"> Aspects of Precision Calculations of Nucleon Generalized Form Factors with Domain Wall Fermions on an Asqtad Sea </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-lat?searchtype=author&query=Bratt%2C+J+D">J. D. Bratt</a>, <a href="/search/hep-lat?searchtype=author&query=Edwards%2C+R+G">R. G. Edwards</a>, <a href="/search/hep-lat?searchtype=author&query=Engelhardt%2C+M">M. Engelhardt</a>, <a href="/search/hep-lat?searchtype=author&query=Fleming%2C+G+T">G. T. Fleming</a>, <a href="/search/hep-lat?searchtype=author&query=Hagler%2C+P">Ph. Hagler</a>, <a href="/search/hep-lat?searchtype=author&query=Lin%2C+M+F">M. F. Lin</a>, <a href="/search/hep-lat?searchtype=author&query=Meyer%2C+H+B">H. B. Meyer</a>, <a href="/search/hep-lat?searchtype=author&query=Musch%2C+B">B. Musch</a>, <a href="/search/hep-lat?searchtype=author&query=Negele%2C+J+W">J. W. Negele</a>, <a href="/search/hep-lat?searchtype=author&query=Orginos%2C+K">K. Orginos</a>, <a href="/search/hep-lat?searchtype=author&query=Pochinsky%2C+A+V">A. V. Pochinsky</a>, <a href="/search/hep-lat?searchtype=author&query=Procura%2C+M">M. Procura</a>, <a href="/search/hep-lat?searchtype=author&query=Renner%2C+D+B">D. B. Renner</a>, <a href="/search/hep-lat?searchtype=author&query=Richards%2C+D+G">D. G. Richards</a>, <a href="/search/hep-lat?searchtype=author&query=Schroers%2C+W">W. Schroers</a>, <a href="/search/hep-lat?searchtype=author&query=Syritsyn%2C+S">S. Syritsyn</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="0810.1933v1-abstract-short" style="display: inline;"> In order to advance lattice calculations of moments of unpolarized, helicity, and transversity distributions, electromagnetic form factors, and generalized form factors of the nucleon to a new level of precision, this work investigates several key aspects of precision lattice calculations. We calculate the number of configurations required for constant statistical errors as a function of pion ma… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('0810.1933v1-abstract-full').style.display = 'inline'; document.getElementById('0810.1933v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="0810.1933v1-abstract-full" style="display: none;"> In order to advance lattice calculations of moments of unpolarized, helicity, and transversity distributions, electromagnetic form factors, and generalized form factors of the nucleon to a new level of precision, this work investigates several key aspects of precision lattice calculations. We calculate the number of configurations required for constant statistical errors as a function of pion mass, describe the coherent sink method to help achieve these statistics, examine the statistical correlations between separate measurements, study correlations in the behavior of form factors at different momentum transfer, examine volume dependence, and compare mixed action results with those using comparable dynamical domain wall configurations. We also show selected form factor results and comment on the QCD evolution of our calculations of the flavor non-singlet nucleon angular momentum. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('0810.1933v1-abstract-full').style.display = 'none'; document.getElementById('0810.1933v1-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> 10 October, 2008; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> October 2008. </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">13 pages, 17 figures. Talks presented at the XXVI International Symposium on Lattice Field Theory, July 14 - 19 2008, Williamsburg, Virginia, USA</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Report number:</span> MIT-CTP 3991 </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> PoS LATTICE2008:141,2008 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/0806.4549">arXiv:0806.4549</a> <span> [<a href="https://arxiv.org/pdf/0806.4549">pdf</a>, <a href="https://arxiv.org/ps/0806.4549">ps</a>, <a href="https://arxiv.org/format/0806.4549">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.79.054502">10.1103/PhysRevD.79.054502 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Light hadron spectroscopy using domain wall valence quarks on an Asqtad sea </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-lat?searchtype=author&query=Walker-Loud%2C+A">Andre Walker-Loud</a>, <a href="/search/hep-lat?searchtype=author&query=Lin%2C+H">Huey-Wen Lin</a>, <a href="/search/hep-lat?searchtype=author&query=Orginos%2C+K">Kostas Orginos</a>, <a href="/search/hep-lat?searchtype=author&query=Richards%2C+D+G">D. G. Richards</a>, <a href="/search/hep-lat?searchtype=author&query=Edwards%2C+R+G">R. G. Edwards</a>, <a href="/search/hep-lat?searchtype=author&query=Engelhardt%2C+M">M. Engelhardt</a>, <a href="/search/hep-lat?searchtype=author&query=Flemming%2C+G+T">G. T. Flemming</a>, <a href="/search/hep-lat?searchtype=author&query=Hagler%2C+P">Ph. Hagler</a>, <a href="/search/hep-lat?searchtype=author&query=Musch%2C+B">B. Musch</a>, <a href="/search/hep-lat?searchtype=author&query=Lin%2C+M+F">M. F. Lin</a>, <a href="/search/hep-lat?searchtype=author&query=Meyer%2C+H+B">Harvey B. Meyer</a>, <a href="/search/hep-lat?searchtype=author&query=Negele%2C+J+W">John W. Negele</a>, <a href="/search/hep-lat?searchtype=author&query=Pochinsky%2C+A+V">A. V. Pochinsky</a>, <a href="/search/hep-lat?searchtype=author&query=Procura%2C+M">Massimiliano Procura</a>, <a href="/search/hep-lat?searchtype=author&query=Syritsyn%2C+S">Sergey Syritsyn</a>, <a href="/search/hep-lat?searchtype=author&query=Morningstar%2C+C+J">C. J. Morningstar</a>, <a href="/search/hep-lat?searchtype=author&query=Renner%2C+D+B">D. B. Renner</a>, <a href="/search/hep-lat?searchtype=author&query=Schroers%2C+W">W. Schroers</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="0806.4549v2-abstract-short" style="display: inline;"> We calculate the light hadron spectrum in full QCD using two plus one flavor Asqtad sea quarks and domain wall valence quarks. Meson and baryon masses are calculated on a lattice of spatial size $L \approx 2.5$\texttt{fm}, and a lattice spacing of $a \approx 0.124$\texttt{fm}, for pion masses as light as $m_蟺\approx 300$\texttt{MeV}, and compared with the results by the MILC collaboration with A… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('0806.4549v2-abstract-full').style.display = 'inline'; document.getElementById('0806.4549v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="0806.4549v2-abstract-full" style="display: none;"> We calculate the light hadron spectrum in full QCD using two plus one flavor Asqtad sea quarks and domain wall valence quarks. Meson and baryon masses are calculated on a lattice of spatial size $L \approx 2.5$\texttt{fm}, and a lattice spacing of $a \approx 0.124$\texttt{fm}, for pion masses as light as $m_蟺\approx 300$\texttt{MeV}, and compared with the results by the MILC collaboration with Asqtad valence quarks at the same lattice spacing. Two- and three-flavor chiral extrapolations of the baryon masses are performed using both continuum and mixed-action heavy baryon chiral perturbation theory. Both the three-flavor and two-flavor functional forms describe our lattice results, although the low-energy constants from the next-to-leading order SU(3) fits are inconsistent with their phenomenological values. Next-to-next-to-leading order SU(2) continuum formulae provide a good fit to the data and yield and extrapolated nucleon mass consistent with experiment, but the convergence pattern indicates that even our lightest pion mass may be at the upper end of the chiral regime. Surprisingly, our nucleon masses are essentially lineaer in $m_蟺$ over our full range of pion masses, and we show this feature is common to all recent dynamical calculations of the nucleon mass. The origin of this linearity is not presently understood, and lighter pion masses and increased control of systematic errors will be needed to resolve this puzzling behavior. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('0806.4549v2-abstract-full').style.display = 'none'; document.getElementById('0806.4549v2-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, 2009; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 27 June, 2008; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> June 2008. </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 published in PRD, 41 pages, 16 figures, 20 tables</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Report number:</span> MIT-CTP 3954, TUM-T39-08-11, UMD-40762-412 </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys.Rev.D79:054502,2009 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/0710.4621">arXiv:0710.4621</a> <span> [<a href="https://arxiv.org/pdf/0710.4621">pdf</a>, <a href="https://arxiv.org/ps/0710.4621">ps</a>, <a href="https://arxiv.org/format/0710.4621">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.77.085012">10.1103/PhysRevD.77.085012 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> The nucleon to Delta electromagnetic transition form factors 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=Koutsou%2C+G">G. Koutsou</a>, <a href="/search/hep-lat?searchtype=author&query=Neff%2C+H">H. Neff</a>, <a href="/search/hep-lat?searchtype=author&query=Negele%2C+J+W">J. W. Negele</a>, <a href="/search/hep-lat?searchtype=author&query=Schroers%2C+W">W. Schroers</a>, <a href="/search/hep-lat?searchtype=author&query=Tsapalis%2C+A">A. Tsapalis</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="0710.4621v1-abstract-short" style="display: inline;"> The electromagnetic nucleon to Delta transition form factors are evaluated using two degenerate flavors of dynamical Wilson fermions and using dynamical sea staggered fermions with domain wall valence quarks. The two subdominant quadrupole form factors are evaluated for the first time in full QCD to sufficient accuracy to exclude a zero value, which is taken as a signal for deformation in the nu… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('0710.4621v1-abstract-full').style.display = 'inline'; document.getElementById('0710.4621v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="0710.4621v1-abstract-full" style="display: none;"> The electromagnetic nucleon to Delta transition form factors are evaluated using two degenerate flavors of dynamical Wilson fermions and using dynamical sea staggered fermions with domain wall valence quarks. The two subdominant quadrupole form factors are evaluated for the first time in full QCD to sufficient accuracy to exclude a zero value, which is taken as a signal for deformation in the nucleon-Delta system. For the Coulomb quadrupole form factor the unquenched results show deviations from the quenched results at low q^2 bringing dynamical lattice results closer to experiment, thereby confirming the importance of pion cloud contributions on this quantity. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('0710.4621v1-abstract-full').style.display = 'none'; document.getElementById('0710.4621v1-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 October, 2007; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> October 2007. </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">15 pages, 8 Figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Report number:</span> MIT-CTP 3888 </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys.Rev.D77:085012,2008 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/0710.4423">arXiv:0710.4423</a> <span> [<a href="https://arxiv.org/pdf/0710.4423">pdf</a>, <a href="https://arxiv.org/ps/0710.4423">ps</a>, <a href="https://arxiv.org/format/0710.4423">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"> Transverse momentum distributions of quarks from the lattice using extended gauge links </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-lat?searchtype=author&query=Musch%2C+B+U">Bernhard U. Musch</a>, <a href="/search/hep-lat?searchtype=author&query=H%C3%A4gler%2C+P">Philipp H盲gler</a>, <a href="/search/hep-lat?searchtype=author&query=Sch%C3%A4fer%2C+A">Andreas Sch盲fer</a>, <a href="/search/hep-lat?searchtype=author&query=G%C3%B6ckeler%2C+M">Meinulf G枚ckeler</a>, <a href="/search/hep-lat?searchtype=author&query=Renner%2C+D+B">Dru B. Renner</a>, <a href="/search/hep-lat?searchtype=author&query=Negele%2C+J+W">John W. Negele</a>, <a href="/search/hep-lat?searchtype=author&query=Collaboration%2C+L">LHPC Collaboration</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="0710.4423v1-abstract-short" style="display: inline;"> We present preliminary numerical studies in Lattice QCD related to the intrinsic transverse momentum distribution of partons in the nucleon. We employ non-local operators, consisting of spatially separated quark creation and annihilation operators connected by a straight Wilson line. A clear signal is already obtained from a small number of configurations at a pion mass of about 600 MeV. As an e… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('0710.4423v1-abstract-full').style.display = 'inline'; document.getElementById('0710.4423v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="0710.4423v1-abstract-full" style="display: none;"> We present preliminary numerical studies in Lattice QCD related to the intrinsic transverse momentum distribution of partons in the nucleon. We employ non-local operators, consisting of spatially separated quark creation and annihilation operators connected by a straight Wilson line. A clear signal is already obtained from a small number of configurations at a pion mass of about 600 MeV. As an example, we demonstrate that we can obtain the first x-moment of the transverse momentum dependent parton distribution function f_1^{n=1}(k_T) from our data. Our results, which are not renormalized, show a Gaussian-like distribution. The root mean squared transverse momentum is about 560 MeV for a Gaussian fit, close to phenomenological values. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('0710.4423v1-abstract-full').style.display = 'none'; document.getElementById('0710.4423v1-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 October, 2007; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> October 2007. </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, 7 figures, presented at the XXV International Symposium on Lattice Field Theory, July 30 - August 4 2007, Regensburg, Germany</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> PoSLAT2007:155,2007 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/0710.2744">arXiv:0710.2744</a> <span> [<a href="https://arxiv.org/pdf/0710.2744">pdf</a>, <a href="https://arxiv.org/ps/0710.2744">ps</a>, <a href="https://arxiv.org/format/0710.2744">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"> Electromagnetic form factors of the Delta baryon </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=Korzec%2C+T">Tomasz Korzec</a>, <a href="/search/hep-lat?searchtype=author&query=Leontiou%2C+T">Theodoros Leontiou</a>, <a href="/search/hep-lat?searchtype=author&query=Negele%2C+J+W">John W. Negele</a>, <a href="/search/hep-lat?searchtype=author&query=Tsapalis%2C+A">Antonios Tsapalis</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="0710.2744v1-abstract-short" style="display: inline;"> We develop a methodology that enables us to extract accurately the electromagnetic Delta form factors and their momentum dependence. We test our approach in the quenched approximation as a preparation for a study using dynamical fermions. Our calculation of the four form factors covers pion masses between about 410 MeV and 560 MeV on lattices with a size of 2.9 fm and a lattice spacing 0.09 fm.… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('0710.2744v1-abstract-full').style.display = 'inline'; document.getElementById('0710.2744v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="0710.2744v1-abstract-full" style="display: none;"> We develop a methodology that enables us to extract accurately the electromagnetic Delta form factors and their momentum dependence. We test our approach in the quenched approximation as a preparation for a study using dynamical fermions. Our calculation of the four form factors covers pion masses between about 410 MeV and 560 MeV on lattices with a size of 2.9 fm and a lattice spacing 0.09 fm. From the form factors we are able to obtain estimates of the magnetic moment and the charge radius of the Delta, which we compare to existing experimental and theoretical results.Our non-zero result for the electric quadrupole form factor signals a deformation of the Delta, pointing to an oblate charge distribution. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('0710.2744v1-abstract-full').style.display = 'none'; document.getElementById('0710.2744v1-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 October, 2007; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> October 2007. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> PoSLAT2007:149,2007 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/0710.2173">arXiv:0710.2173</a> <span> [<a href="https://arxiv.org/pdf/0710.2173">pdf</a>, <a href="https://arxiv.org/ps/0710.2173">ps</a>, <a href="https://arxiv.org/format/0710.2173">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 and Nucleon to Delta Axial 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=Koutsou%2C+G">G. Koutsou</a>, <a href="/search/hep-lat?searchtype=author&query=Leontiou%2C+T">Th. Leontiou</a>, <a href="/search/hep-lat?searchtype=author&query=Negele%2C+J+W">J. W. Negele</a>, <a href="/search/hep-lat?searchtype=author&query=Tsapalis%2C+A">A. Tsapalis</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="0710.2173v1-abstract-short" style="display: inline;"> We present results on the nucleon axial vector form factors $G_A(q^2)$ and $G_p(q^2)$ in the quenched theory and using two degenerate flavors of dynamical Wilson fermions for momentum transfer squared from about 0.1 to about 2 GeV^2 and for pion masses in the range of 380 to 600 MeV. We also present results on the corresponding N to Delta axial vector transition form factors $C_5^A(q^2)$ and… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('0710.2173v1-abstract-full').style.display = 'inline'; document.getElementById('0710.2173v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="0710.2173v1-abstract-full" style="display: none;"> We present results on the nucleon axial vector form factors $G_A(q^2)$ and $G_p(q^2)$ in the quenched theory and using two degenerate flavors of dynamical Wilson fermions for momentum transfer squared from about 0.1 to about 2 GeV^2 and for pion masses in the range of 380 to 600 MeV. We also present results on the corresponding N to Delta axial vector transition form factors $C_5^A(q^2)$ and $C_6^A(q^2)$ using, in addition to Wilson fermions, domain wall valence quarks and dynamical staggered sea quarks provided by the MILC collaboration. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('0710.2173v1-abstract-full').style.display = 'none'; document.getElementById('0710.2173v1-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, 2007; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> October 2007. </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, talk presented at the XXV International Symposium on Lattice Field Theory, July 30 - August 4 2007, Regensburg, Germany</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> PoSLAT2007:162,2007 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/0710.1373">arXiv:0710.1373</a> <span> [<a href="https://arxiv.org/pdf/0710.1373">pdf</a>, <a href="https://arxiv.org/ps/0710.1373">ps</a>, <a href="https://arxiv.org/format/0710.1373">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 from domain wall valence quarks and staggered sea quarks </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-lat?searchtype=author&query=LHPC+Collaboration"> LHPC Collaboration</a>, <a href="/search/hep-lat?searchtype=author&query=Renner%2C+D+B">D. B. Renner</a>, <a href="/search/hep-lat?searchtype=author&query=Bratt%2C+J">J. Bratt</a>, <a href="/search/hep-lat?searchtype=author&query=Edwards%2C+R+G">R. G. Edwards</a>, <a href="/search/hep-lat?searchtype=author&query=Engelhardt%2C+M">M. Engelhardt</a>, <a href="/search/hep-lat?searchtype=author&query=Fleming%2C+G">G. Fleming</a>, <a href="/search/hep-lat?searchtype=author&query=H%C3%A4gler%2C+P">Ph. H盲gler</a>, <a href="/search/hep-lat?searchtype=author&query=Musch%2C+B">B. Musch</a>, <a href="/search/hep-lat?searchtype=author&query=Negele%2C+J+W">J. W. Negele</a>, <a href="/search/hep-lat?searchtype=author&query=Orginos%2C+K">K. Orginos</a>, <a href="/search/hep-lat?searchtype=author&query=Pochinsky%2C+A+V">A. V. Pochinsky</a>, <a href="/search/hep-lat?searchtype=author&query=Richards%2C+D+G">D. G. Richards</a>, <a href="/search/hep-lat?searchtype=author&query=Schroers%2C+W">W. Schroers</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="0710.1373v2-abstract-short" style="display: inline;"> Moments of the generalized parton distributions of the nucleon, calculated with a mixed action of domain wall valence quarks and asqtad staggered sea quarks, are presented for pion masses extending down to 359 MeV. Results for the moments of the unpolarized, helicity, and transversity distributions are given and compared to the available experimental measurements. Additionally, a selection of th… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('0710.1373v2-abstract-full').style.display = 'inline'; document.getElementById('0710.1373v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="0710.1373v2-abstract-full" style="display: none;"> Moments of the generalized parton distributions of the nucleon, calculated with a mixed action of domain wall valence quarks and asqtad staggered sea quarks, are presented for pion masses extending down to 359 MeV. Results for the moments of the unpolarized, helicity, and transversity distributions are given and compared to the available experimental measurements. Additionally, a selection of the generalized form factors are shown and the implications for the spin decomposition and transverse structure of the nucleon are discussed. Particular emphasis is placed on understanding systematic errors in the lattice calculation and exploring a variety of chiral extrapolations. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('0710.1373v2-abstract-full').style.display = 'none'; document.getElementById('0710.1373v2-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> 12 October, 2007; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 6 October, 2007; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> October 2007. </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">Presented at the XXV International Symposium on Lattice Field Theory, July 30 - August 4 2007, Regensburg, Germany</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> PoS LAT2007:160,2007 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/0710.0425">arXiv:0710.0425</a> <span> [<a href="https://arxiv.org/pdf/0710.0425">pdf</a>, <a href="https://arxiv.org/ps/0710.0425">ps</a>, <a href="https://arxiv.org/format/0710.0425">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"> Oscillatory terms in the domain wall transfer matrix </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-lat?searchtype=author&query=Syritsyn%2C+S">Sergey Syritsyn</a>, <a href="/search/hep-lat?searchtype=author&query=Negele%2C+J+W">John W. Negele</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="0710.0425v1-abstract-short" style="display: inline;"> We study the transfer matrix for domain wall fermions to understand the origin and significance of oscillatory contributions to hadron correlation functions that arise for M >1. For a free particle in one space, one time, and one flavor dimension, the eigenmodes of the one-body operator appearing in the transfer matrix are calculated, and the role of the negative eigenmodes arising when M > 1 is… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('0710.0425v1-abstract-full').style.display = 'inline'; document.getElementById('0710.0425v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="0710.0425v1-abstract-full" style="display: none;"> We study the transfer matrix for domain wall fermions to understand the origin and significance of oscillatory contributions to hadron correlation functions that arise for M >1. For a free particle in one space, one time, and one flavor dimension, the eigenmodes of the one-body operator appearing in the transfer matrix are calculated, and the role of the negative eigenmodes arising when M > 1 is studied. In the case of three space dimensions, oscillatory behavior for hadron correlation functions in QCD is shown to emerge for free fermions when M exceeds 1, and to increase with increasing M. Analogous behavior is observed for domain wall fermions on HYP smeared MILC lattices, and a procedure is demonstrated for subtracting oscillating terms from physical observables. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('0710.0425v1-abstract-full').style.display = 'none'; document.getElementById('0710.0425v1-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, 2007; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> October 2007. </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 Lattice 2007 July 30 - August 4 2007, Regensburg, Germany</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Report number:</span> MIT-CTP 3875 </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> PoSLAT2007:078,2007 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/0710.0019">arXiv:0710.0019</a> <span> [<a href="https://arxiv.org/pdf/0710.0019">pdf</a>, <a href="https://arxiv.org/ps/0710.0019">ps</a>, <a href="https://arxiv.org/format/0710.0019">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"> The Glue Content of the Pion </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-lat?searchtype=author&query=Meyer%2C+H+B">Harvey B. Meyer</a>, <a href="/search/hep-lat?searchtype=author&query=Negele%2C+J+W">John W. Negele</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="0710.0019v1-abstract-short" style="display: inline;"> We perform a quenched computation of the glue momentum fraction in the pion. Different discretizations of the gluonic energy-momentum tensor are studied on the lattice for that purpose. We discuss some implications based on the momentum sum rule. Finally we point out promising applications of the techniques developed here. </span> <span class="abstract-full has-text-grey-dark mathjax" id="0710.0019v1-abstract-full" style="display: none;"> We perform a quenched computation of the glue momentum fraction in the pion. Different discretizations of the gluonic energy-momentum tensor are studied on the lattice for that purpose. We discuss some implications based on the momentum sum rule. Finally we point out promising applications of the techniques developed here. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('0710.0019v1-abstract-full').style.display = 'none'; document.getElementById('0710.0019v1-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, 2007; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> October 2007. </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, 2 figures, 2 tables; Proceedings of LATTICE07</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Report number:</span> MIT-CTP 3872 </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> PoSLAT2007:154,2007 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/0709.3386">arXiv:0709.3386</a> <span> [<a href="https://arxiv.org/pdf/0709.3386">pdf</a>, <a href="https://arxiv.org/format/0709.3386">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"> Exploring the transition into the Chiral Regime of QCD using the Interacting Instanton Liquid Model </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-lat?searchtype=author&query=Cristoforetti%2C+M">M. Cristoforetti</a>, <a href="/search/hep-lat?searchtype=author&query=Faccioli%2C+P">P. Faccioli</a>, <a href="/search/hep-lat?searchtype=author&query=Traini%2C+M">M. Traini</a>, <a href="/search/hep-lat?searchtype=author&query=Negele%2C+J+W">J. W. Negele</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="0709.3386v1-abstract-short" style="display: inline;"> The non-perturbative quark-gluon interaction depends significantly on the value of the quark mass. In particular, in the light quark mass regime, correlations are strongly influenced by dynamics associated to chiral symmetry breaking. We use the Interacting Instanton Liquid Model (IILM) as a tool to investigate the microscopic dynamical mechanisms which underly the dependence on the quark mass a… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('0709.3386v1-abstract-full').style.display = 'inline'; document.getElementById('0709.3386v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="0709.3386v1-abstract-full" style="display: none;"> The non-perturbative quark-gluon interaction depends significantly on the value of the quark mass. In particular, in the light quark mass regime, correlations are strongly influenced by dynamics associated to chiral symmetry breaking. We use the Interacting Instanton Liquid Model (IILM) as a tool to investigate the microscopic dynamical mechanisms which underly the dependence on the quark mass and drive the transition into the chiral regime of QCD. To ensure the validity of the model, we first verify that the dependence on the quark mass for several observables calculated in the IILM agrees well with the predictions of chiral perturbation theory and with lattice simulations. We then show that a quark mass m*~80 MeV emerging naturally from the model specifies the mass scale above which the dynamics associated with low-lying eigenmodes of the Direac operator becomes sub-leading and the contribution of the fermion determinant is suppressed. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('0709.3386v1-abstract-full').style.display = 'none'; document.getElementById('0709.3386v1-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 September, 2007; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> September 2007. </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 XXV International Symposium on Lattice Field Theory, July 2007, Regensburg</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> PoSLAT2007:142,2007 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/0708.1687">arXiv:0708.1687</a> <span> [<a href="https://arxiv.org/pdf/0708.1687">pdf</a>, <a href="https://arxiv.org/ps/0708.1687">ps</a>, <a href="https://arxiv.org/format/0708.1687">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> <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/10.1016/j.aop.2007.11.009">10.1016/j.aop.2007.11.009 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Confining Effective Theories Based on Instantons and Merons </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-lat?searchtype=author&query=Lenz%2C+F">F. Lenz</a>, <a href="/search/hep-lat?searchtype=author&query=Negele%2C+J+W">J. W. Negele</a>, <a href="/search/hep-lat?searchtype=author&query=Thies%2C+M">M. Thies</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="0708.1687v1-abstract-short" style="display: inline;"> An effective theory based on ensembles of either regular gauge instantons or merons is shown to produce confinement in SU(2) Yang-Mills theory. When the scale is set by the string tension, the action density, topological susceptibility and low-lying glueball spectrum are similar to those arising in lattice QCD. The physical mechanism producing confinement is explained, and a number of analytical… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('0708.1687v1-abstract-full').style.display = 'inline'; document.getElementById('0708.1687v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="0708.1687v1-abstract-full" style="display: none;"> An effective theory based on ensembles of either regular gauge instantons or merons is shown to produce confinement in SU(2) Yang-Mills theory. When the scale is set by the string tension, the action density, topological susceptibility and low-lying glueball spectrum are similar to those arising in lattice QCD. The physical mechanism producing confinement is explained, and a number of analytical insights into the effective theory are presented. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('0708.1687v1-abstract-full').style.display = 'none'; document.getElementById('0708.1687v1-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 August, 2007; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> August 2007. </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">53 pages, 41 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> AnnalsPhys.323:1536-1587,2008 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/0707.3225">arXiv:0707.3225</a> <span> [<a href="https://arxiv.org/pdf/0707.3225">pdf</a>, <a href="https://arxiv.org/ps/0707.3225">ps</a>, <a href="https://arxiv.org/format/0707.3225">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.77.037501">10.1103/PhysRevD.77.037501 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Gluon contributions to the pion mass and light cone momentum fraction </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-lat?searchtype=author&query=Meyer%2C+H+B">Harvey B. Meyer</a>, <a href="/search/hep-lat?searchtype=author&query=Negele%2C+J+W">John W. Negele</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="0707.3225v1-abstract-short" style="display: inline;"> We calculate the matrix elements of the gluonic contributions to the energy-momentum tensor for a pion of mass 600 < Mpi < 1100 MeV in quenched lattice QCD. We find that gluons contribute (37 +/- 8 +/- 12)% of the pion's light cone momentum. The bare matrix elements corresponding to the trace anomaly contribution to the pion mass are also obtained. The discretizations of the energy-momentum tens… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('0707.3225v1-abstract-full').style.display = 'inline'; document.getElementById('0707.3225v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="0707.3225v1-abstract-full" style="display: none;"> We calculate the matrix elements of the gluonic contributions to the energy-momentum tensor for a pion of mass 600 < Mpi < 1100 MeV in quenched lattice QCD. We find that gluons contribute (37 +/- 8 +/- 12)% of the pion's light cone momentum. The bare matrix elements corresponding to the trace anomaly contribution to the pion mass are also obtained. The discretizations of the energy-momentum tensor we use have other promising applications, ranging from calculating the origin of hadron spin to QCD thermodynamics. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('0707.3225v1-abstract-full').style.display = 'none'; document.getElementById('0707.3225v1-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 July, 2007; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> July 2007. </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">4 pages, 2 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Report number:</span> MIT-CTP 3840 </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys.Rev.D77:037501,2008 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/0706.3011">arXiv:0706.3011</a> <span> [<a href="https://arxiv.org/pdf/0706.3011">pdf</a>, <a href="https://arxiv.org/ps/0706.3011">ps</a>, <a href="https://arxiv.org/format/0706.3011">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.76.094511">10.1103/PhysRevD.76.094511 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </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.80.099901">10.1103/PhysRevD.80.099901 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Axial Nucleon and Nucleon to Delta form fractors and the Goldberger-Treiman Relations 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=Koutsou%2C+G">G. Koutsou</a>, <a href="/search/hep-lat?searchtype=author&query=Leontiou%2C+T">Th. Leontiou</a>, <a href="/search/hep-lat?searchtype=author&query=Negele%2C+J+W">J. W. Negele</a>, <a href="/search/hep-lat?searchtype=author&query=Tsapalis%2C+A">A. Tsapalis</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="0706.3011v1-abstract-short" style="display: inline;"> We evaluate the nucleon axial form factor, $G_A(q^2)$, and induced pseudoscalar form factor, $G_p(q^2)$, as well as the pion-nucleon form factor, $G_{蟺N N}(q^2)$, in lattice QCD. We also evaluate the corresponding nucleon to $螖$ transition form factors, $C_5^A(q^2)$ and $C_6^A(q^2)$, and the pion-nucleon-$螖$ form factor $G_{蟺N螖}(q^2)$. The nucleon form factors are evaluated in the quenched theor… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('0706.3011v1-abstract-full').style.display = 'inline'; document.getElementById('0706.3011v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="0706.3011v1-abstract-full" style="display: none;"> We evaluate the nucleon axial form factor, $G_A(q^2)$, and induced pseudoscalar form factor, $G_p(q^2)$, as well as the pion-nucleon form factor, $G_{蟺N N}(q^2)$, in lattice QCD. We also evaluate the corresponding nucleon to $螖$ transition form factors, $C_5^A(q^2)$ and $C_6^A(q^2)$, and the pion-nucleon-$螖$ form factor $G_{蟺N螖}(q^2)$. The nucleon form factors are evaluated in the quenched theory and with two degenerate flavors of dynamical Wilson fermions. The nucleon to $螖$ form factors, besides Wilson fermions, are evaluated using domain wall valence fermions with staggered sea quark configurations for pion masses as low as about 350 MeV. Using these form factors, together with an evaluation of the renormalized quark mass, we investigate the validity of the diagonal and non-diagonal Goldberger-Treiman relations. The ratios $G_{蟺N螖}(q^2)/G_{蟺NN}(q^2)$ and $2C_5^A(q^2)/G_A(q^2)$ are constant as a function of the momentum transfer squared and show almost no dependence on the quark mass. We confirm equality of these two ratios consistent with the Goldberger-Treiman relations extracting a mean value of $1.61(2)$. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('0706.3011v1-abstract-full').style.display = 'none'; document.getElementById('0706.3011v1-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 June, 2007; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> June 2007. </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, 22 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Report number:</span> MIT-CTP 3845 </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys.Rev.D76:094511,2007; Erratum-ibid.D80:099901,2009 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/0705.4295">arXiv:0705.4295</a> <span> [<a href="https://arxiv.org/pdf/0705.4295">pdf</a>, <a href="https://arxiv.org/ps/0705.4295">ps</a>, <a href="https://arxiv.org/format/0705.4295">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.77.094502">10.1103/PhysRevD.77.094502 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Nucleon Generalized Parton Distributions from Full Lattice QCD </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-lat?searchtype=author&query=H%C3%A4gler%2C+P">Ph. H盲gler</a>, <a href="/search/hep-lat?searchtype=author&query=Schroers%2C+W">W. Schroers</a>, <a href="/search/hep-lat?searchtype=author&query=Bratt%2C+J">J. Bratt</a>, <a href="/search/hep-lat?searchtype=author&query=Edwards%2C+R+G">R. G. Edwards</a>, <a href="/search/hep-lat?searchtype=author&query=Engelhardt%2C+M">M. Engelhardt</a>, <a href="/search/hep-lat?searchtype=author&query=Fleming%2C+G+T">G. T. Fleming</a>, <a href="/search/hep-lat?searchtype=author&query=Musch%2C+B">B. Musch</a>, <a href="/search/hep-lat?searchtype=author&query=Negele%2C+J+W">J. W. Negele</a>, <a href="/search/hep-lat?searchtype=author&query=Orginos%2C+K">K. Orginos</a>, <a href="/search/hep-lat?searchtype=author&query=Pochinsky%2C+A+V">A. V. Pochinsky</a>, <a href="/search/hep-lat?searchtype=author&query=Renner%2C+D+B">D. B. Renner</a>, <a href="/search/hep-lat?searchtype=author&query=Richards%2C+D+G">D. G. Richards</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="0705.4295v2-abstract-short" style="display: inline;"> We present a comprehensive study of the lowest moments of nucleon generalized parton distributions in N_f=2+1 lattice QCD using domain wall valence quarks and improved staggered sea quarks. Our investigation includes helicity dependent and independent generalized parton distributions for pion masses as low as 350 MeV and volumes as large as (3.5 fm)^3, for a lattice spacing of 0.124 fm. We use p… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('0705.4295v2-abstract-full').style.display = 'inline'; document.getElementById('0705.4295v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="0705.4295v2-abstract-full" style="display: none;"> We present a comprehensive study of the lowest moments of nucleon generalized parton distributions in N_f=2+1 lattice QCD using domain wall valence quarks and improved staggered sea quarks. Our investigation includes helicity dependent and independent generalized parton distributions for pion masses as low as 350 MeV and volumes as large as (3.5 fm)^3, for a lattice spacing of 0.124 fm. We use perturbative renormalization at one-loop level with an improvement based on the non-perturbative renormalization factor for the axial vector current, and only connected diagrams are included in the isosinglet channel. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('0705.4295v2-abstract-full').style.display = 'none'; document.getElementById('0705.4295v2-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 May, 2008; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 30 May, 2007; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> May 2007. </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">40 pages, 49 figures; Revised chiral extrapolations in sections A-K, main conclusions unchanged</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Report number:</span> DESY 07-077, JLAB-THY-07-651, TUM-T39-07-09 </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys.Rev.D77:094502,2008 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/hep-lat/0610107">arXiv:hep-lat/0610107</a> <span> [<a href="https://arxiv.org/pdf/hep-lat/0610107">pdf</a>, <a href="https://arxiv.org/ps/hep-lat/0610107">ps</a>, <a href="https://arxiv.org/format/hep-lat/0610107">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"> The N to $螖$ axial transition form factors in quenched and unquenched 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=Leontiou%2C+T">Theodoros Leontiou</a>, <a href="/search/hep-lat?searchtype=author&query=Negele%2C+J+W">John W. Negele</a>, <a href="/search/hep-lat?searchtype=author&query=Tsapalis%2C+A">Antonios Tsapalis</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="hep-lat/0610107v2-abstract-short" style="display: inline;"> The four N to $螖$ axial transition form factors are evaluated using quenched QCD, using two flavors of dynamical Wilson fermions and using domain wall valence fermions on three-flavor MILC configurations for pion masses down to 360 MeV. We provide a prediction for the parity violating asymmetry as a function of $Q^2$ and examine the validity of the non-diagonal Goldberger-Treiman relation. </span> <span class="abstract-full has-text-grey-dark mathjax" id="hep-lat/0610107v2-abstract-full" style="display: none;"> The four N to $螖$ axial transition form factors are evaluated using quenched QCD, using two flavors of dynamical Wilson fermions and using domain wall valence fermions on three-flavor MILC configurations for pion masses down to 360 MeV. We provide a prediction for the parity violating asymmetry as a function of $Q^2$ and examine the validity of the non-diagonal Goldberger-Treiman relation. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('hep-lat/0610107v2-abstract-full').style.display = 'none'; document.getElementById('hep-lat/0610107v2-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, 2007; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 19 October, 2006; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> October 2006. </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">Normalization factor in figures 3 and 4 corrected, discussion on the evaluation of the renormalized qaurk mass included, typos corrected, 7 pages, 6 figures, talk presented at the XXIV International Symposium on Lattice Field Theory, 23rd - 28th of July, 2006</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> PoSLAT2006:115,2006 </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=Negele%2C+J+W&start=50" class="pagination-next" >Next </a> <ul class="pagination-list"> <li> <a href="/search/?searchtype=author&query=Negele%2C+J+W&start=0" class="pagination-link is-current" aria-label="Goto page 1">1 </a> </li> <li> <a href="/search/?searchtype=author&query=Negele%2C+J+W&start=50" class="pagination-link " aria-label="Page 2" aria-current="page">2 </a> </li> <li> <a href="/search/?searchtype=author&query=Negele%2C+J+W&start=100" class="pagination-link " aria-label="Page 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