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</div> <div class="control"> <button class="button is-small is-link">Go</button> </div> </div> </form> </div> </div> <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/hep-lat/0609034">arXiv:hep-lat/0609034</a> <span> [<a href="https://arxiv.org/pdf/hep-lat/0609034">pdf</a>, <a href="https://arxiv.org/ps/hep-lat/0609034">ps</a>, <a href="https://arxiv.org/format/hep-lat/0609034">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"> On the Locality and Scaling of Overlap Fermions at Coarse Lattice Spacings </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-lat?searchtype=author&query=Draper%2C+T">Terrence Draper</a>, <a href="/search/hep-lat?searchtype=author&query=Mathur%2C+N">Nilmani Mathur</a>, <a href="/search/hep-lat?searchtype=author&query=Zhang%2C+J">Jianbo Zhang</a>, <a href="/search/hep-lat?searchtype=author&query=Alexandru%2C+A">Andrei Alexandru</a>, <a href="/search/hep-lat?searchtype=author&query=Chen%2C+Y">Ying Chen</a>, <a href="/search/hep-lat?searchtype=author&query=Dong%2C+S">Shao-Jing Dong</a>, <a href="/search/hep-lat?searchtype=author&query=Horvath%2C+I">Ivan Horvath</a>, <a href="/search/hep-lat?searchtype=author&query=Lee%2C+F+X">Frank X. Lee</a>, <a href="/search/hep-lat?searchtype=author&query=Liu%2C+K">Keh-Fei Liu</a>, <a href="/search/hep-lat?searchtype=author&query=Tamhankar%2C+S">Sonali Tamhankar</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/0609034v1-abstract-short" style="display: inline;"> The overlap fermion offers the considerable advantage of exact chiral symmetry on the lattice, but is numerically intensive. This can be made affordable while still providing large lattice volumes, by using coarse lattice spacing, given that good scaling and localization properties are established. Here, using overlap fermions on quenched Iwasaki gauge configurations, we demonstrate directly tha… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('hep-lat/0609034v1-abstract-full').style.display = 'inline'; document.getElementById('hep-lat/0609034v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="hep-lat/0609034v1-abstract-full" style="display: none;"> The overlap fermion offers the considerable advantage of exact chiral symmetry on the lattice, but is numerically intensive. This can be made affordable while still providing large lattice volumes, by using coarse lattice spacing, given that good scaling and localization properties are established. Here, using overlap fermions on quenched Iwasaki gauge configurations, we demonstrate directly that, with appropriate choice of negative Wilson's mass, the overlap Dirac operator's range is comfortably small in lattice units for each of the lattice spacings 0.20 fm, 0.17 fm, and 0.13 fm (and scales to zero in physical units in the continuum limit). In particular, our direct results contradict recent speculation that an inverse lattice spacing of 1 GeV is too low to have satisfactory localization. Furthermore, hadronic masses (available on the two coarser lattices) scale very well. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('hep-lat/0609034v1-abstract-full').style.display = 'none'; document.getElementById('hep-lat/0609034v1-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, 2006; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> September 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">17 pages, 18 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Report number:</span> UK/06-11 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/hep-ph/0607110">arXiv:hep-ph/0607110</a> <span> [<a href="https://arxiv.org/pdf/hep-ph/0607110">pdf</a>, <a href="https://arxiv.org/ps/hep-ph/0607110">ps</a>, <a href="https://arxiv.org/format/hep-ph/0607110">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/10.1103/PhysRevD.76.114505">10.1103/PhysRevD.76.114505 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Scalar Mesons a0(1450) and sigma(600) from Lattice QCD </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-lat?searchtype=author&query=Mathur%2C+N">Nilmani Mathur</a>, <a href="/search/hep-lat?searchtype=author&query=Alexandru%2C+A">A. Alexandru</a>, <a href="/search/hep-lat?searchtype=author&query=Chen%2C+Y">Y. Chen</a>, <a href="/search/hep-lat?searchtype=author&query=Dong%2C+S+J">S. J. Dong</a>, <a href="/search/hep-lat?searchtype=author&query=Draper%2C+T">T. Draper</a>, <a href="/search/hep-lat?searchtype=author&query=Horvath%2C+I">I. Horvath</a>, <a href="/search/hep-lat?searchtype=author&query=Lee%2C+F+X">F. X. Lee</a>, <a href="/search/hep-lat?searchtype=author&query=Liu%2C+K+F">K. F. Liu</a>, <a href="/search/hep-lat?searchtype=author&query=Tamhankar%2C+S">S. Tamhankar</a>, <a href="/search/hep-lat?searchtype=author&query=Zhang%2C+J+B">J. B. Zhang</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-ph/0607110v2-abstract-short" style="display: inline;"> We study the a0 and sigma mesons with the overlap fermion in the chiral regime with the pion mass as low as 182 MeV in the quenched approximation. After the eta'pi ghost states are separated, we find that the a0 mass with q\bar{q} interpolation field to be almost independent of the quark mass in the region below the strange quark mass. The chirally extrapolated results are consistent with a0(145… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('hep-ph/0607110v2-abstract-full').style.display = 'inline'; document.getElementById('hep-ph/0607110v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="hep-ph/0607110v2-abstract-full" style="display: none;"> We study the a0 and sigma mesons with the overlap fermion in the chiral regime with the pion mass as low as 182 MeV in the quenched approximation. After the eta'pi ghost states are separated, we find that the a0 mass with q\bar{q} interpolation field to be almost independent of the quark mass in the region below the strange quark mass. The chirally extrapolated results are consistent with a0(1450) being the u\bar{d} meson and K0*(1430) being the u\bar{s} meson with calculated masses at 1.42+_0.13 GeV and 1.41+_ 0.12 GeV respectively. We also calculate the scalar mesonium with a tetraquark interpolation field. In addition to the two pion scattering states, we find a state at around 550 MeV. Through the study of volume dependence, we confirm that this state is a one-particle state, in contrast to the two-pion scattering states. This suggests that the observed state is a tetraquark mesonium which is quite possibly the sigma(600) meson. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('hep-ph/0607110v2-abstract-full').style.display = 'none'; document.getElementById('hep-ph/0607110v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 4 October, 2007; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 10 July, 2006; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> July 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">11 pages, 9 figures, 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> JLAB-THY-06-511, UK/06-06 </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys.Rev.D76:114505,2007 </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/0510075">arXiv:hep-lat/0510075</a> <span> [<a href="https://arxiv.org/pdf/hep-lat/0510075">pdf</a>, <a href="https://arxiv.org/ps/hep-lat/0510075">ps</a>, <a href="https://arxiv.org/format/hep-lat/0510075">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"> Locality and Scaling of Quenched Overlap Fermions </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-lat?searchtype=author&query=Draper%2C+T">Terrence Draper</a>, <a href="/search/hep-lat?searchtype=author&query=Mathur%2C+N">Nilmani Mathur</a>, <a href="/search/hep-lat?searchtype=author&query=Zhang%2C+J">Jianbo Zhang</a>, <a href="/search/hep-lat?searchtype=author&query=Alexandru%2C+A">Andrei Alexandru</a>, <a href="/search/hep-lat?searchtype=author&query=Chen%2C+Y">Ying Chen</a>, <a href="/search/hep-lat?searchtype=author&query=Dong%2C+S">Shao-Jing Dong</a>, <a href="/search/hep-lat?searchtype=author&query=Horvath%2C+I">Ivan Horvath</a>, <a href="/search/hep-lat?searchtype=author&query=Lee%2C+F">Frank Lee</a>, <a href="/search/hep-lat?searchtype=author&query=Tamhankar%2C+S">Sonali Tamhankar</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/0510075v1-abstract-short" style="display: inline;"> The overlap fermion offers the tremendous advantage of exact chiral symmetry on the lattice, but is numerically intensive. This can be made affordable while still providing large lattice volumes, by using coarse lattice spacing, given that good scaling and localization properties are established. Here, using overlap fermions on quenched Iwasaki gauge configurations, we demonstrate directly that… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('hep-lat/0510075v1-abstract-full').style.display = 'inline'; document.getElementById('hep-lat/0510075v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="hep-lat/0510075v1-abstract-full" style="display: none;"> The overlap fermion offers the tremendous advantage of exact chiral symmetry on the lattice, but is numerically intensive. This can be made affordable while still providing large lattice volumes, by using coarse lattice spacing, given that good scaling and localization properties are established. Here, using overlap fermions on quenched Iwasaki gauge configurations, we demonstrate directly that the overlap Dirac operator's range is comfortably small in lattice units for each of the lattice spacings 0.20 fm, 0.17 fm, and 0.13 fm (and scales to zero in physical units in the continuum limit). In particular, our direct results contradict recent speculation that an inverse lattice spacing of $1 {\rm GeV}$ is too low to have satisfactory localization. Furthermore, hadronic masses (available on the two coarser lattices) scale very well. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('hep-lat/0510075v1-abstract-full').style.display = 'none'; document.getElementById('hep-lat/0510075v1-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 October, 2005; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> October 2005. </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">Lattice 2005 (chiral fermions), 6 pages, 4 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Report number:</span> UK/05-11 </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> PoS LAT2005:120,2006 </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/0510074">arXiv:hep-lat/0510074</a> <span> [<a href="https://arxiv.org/pdf/hep-lat/0510074">pdf</a>, <a href="https://arxiv.org/ps/hep-lat/0510074">ps</a>, <a href="https://arxiv.org/format/hep-lat/0510074">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.73.014516">10.1103/PhysRevD.73.014516 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Glueball Spectrum and Matrix Elements on Anisotropic Lattices </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-lat?searchtype=author&query=Chen%2C+Y">Y. Chen</a>, <a href="/search/hep-lat?searchtype=author&query=Alexandru%2C+A">A. Alexandru</a>, <a href="/search/hep-lat?searchtype=author&query=Dong%2C+S+J">S. J. Dong</a>, <a href="/search/hep-lat?searchtype=author&query=Draper%2C+T">T. Draper</a>, <a href="/search/hep-lat?searchtype=author&query=Horvath%2C+I">I. Horvath</a>, <a href="/search/hep-lat?searchtype=author&query=Lee%2C+F+X">F. X. Lee</a>, <a href="/search/hep-lat?searchtype=author&query=Liu%2C+K+F">K. F. Liu</a>, <a href="/search/hep-lat?searchtype=author&query=Mathur%2C+N">N. Mathur</a>, <a href="/search/hep-lat?searchtype=author&query=Morningstar%2C+C">C. Morningstar</a>, <a href="/search/hep-lat?searchtype=author&query=Peardon%2C+M">M. Peardon</a>, <a href="/search/hep-lat?searchtype=author&query=Tamhankar%2C+S">S. Tamhankar</a>, <a href="/search/hep-lat?searchtype=author&query=Young%2C+B+L">B. L. Young</a>, <a href="/search/hep-lat?searchtype=author&query=Zhang%2C+J+B">J. B. Zhang</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/0510074v1-abstract-short" style="display: inline;"> The glueball-to-vacuum matrix elements of local gluonic operators in scalar, tensor, and pseudoscalar channels are investigated numerically on several anisotropic lattices with the spatial lattice spacing ranging from 0.1fm - 0.2fm. These matrix elements are needed to predict the glueball branching ratios in $J/蠄$ radiative decays which will help identify the glueball states in experiments. Two… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('hep-lat/0510074v1-abstract-full').style.display = 'inline'; document.getElementById('hep-lat/0510074v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="hep-lat/0510074v1-abstract-full" style="display: none;"> The glueball-to-vacuum matrix elements of local gluonic operators in scalar, tensor, and pseudoscalar channels are investigated numerically on several anisotropic lattices with the spatial lattice spacing ranging from 0.1fm - 0.2fm. These matrix elements are needed to predict the glueball branching ratios in $J/蠄$ radiative decays which will help identify the glueball states in experiments. Two types of improved local gluonic operators are constructed for a self-consistent check and the finite volume effects are studied. We find that lattice spacing dependence of our results is very weak and the continuum limits are reliably extrapolated, as a result of improvement of the lattice gauge action and local operators. We also give updated glueball masses with various quantum numbers. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('hep-lat/0510074v1-abstract-full').style.display = 'none'; document.getElementById('hep-lat/0510074v1-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 October, 2005; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> October 2005. </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">22 pages, 16 figures, revtex4</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys.Rev.D73:014516,2006 </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/0507027">arXiv:hep-lat/0507027</a> <span> [<a href="https://arxiv.org/pdf/hep-lat/0507027">pdf</a>, <a href="https://arxiv.org/ps/hep-lat/0507027">ps</a>, <a href="https://arxiv.org/format/hep-lat/0507027">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/10.1016/j.physletb.2006.04.055">10.1016/j.physletb.2006.04.055 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Charmonium Spectrum from Quenched QCD with Overlap Fermions </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-lat?searchtype=author&query=Tamhankar%2C+S">S. Tamhankar</a>, <a href="/search/hep-lat?searchtype=author&query=Alexandru%2C+A">A. Alexandru</a>, <a href="/search/hep-lat?searchtype=author&query=Chen%2C+Y">Y. Chen</a>, <a href="/search/hep-lat?searchtype=author&query=Dong%2C+S+J">S. J. Dong</a>, <a href="/search/hep-lat?searchtype=author&query=Draper%2C+T">T. Draper</a>, <a href="/search/hep-lat?searchtype=author&query=Horvath%2C+I">I. Horvath</a>, <a href="/search/hep-lat?searchtype=author&query=Lee%2C+F+X">F. X. Lee</a>, <a href="/search/hep-lat?searchtype=author&query=Liu%2C+K+F">K. F. Liu</a>, <a href="/search/hep-lat?searchtype=author&query=Mathur%2C+N">N. Mathur</a>, <a href="/search/hep-lat?searchtype=author&query=Zhang%2C+J+B">J. B. Zhang</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/0507027v1-abstract-short" style="display: inline;"> We present the first study of the charmonium spectrum using overlap fermions, on quenched configurations. Simulations are performed on $16^3 \times 72$ lattices, with Wilson gauge action at $尾$ = 6.3345. We demonstrate that we have discretization errors under control at about 5%. We obtain 88(4) MeV for hyperfine splitting using the $r_0$ scale, and 121(6) MeV using the ($1\bar{P}-1\bar{S}$) sca… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('hep-lat/0507027v1-abstract-full').style.display = 'inline'; document.getElementById('hep-lat/0507027v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="hep-lat/0507027v1-abstract-full" style="display: none;"> We present the first study of the charmonium spectrum using overlap fermions, on quenched configurations. Simulations are performed on $16^3 \times 72$ lattices, with Wilson gauge action at $尾$ = 6.3345. We demonstrate that we have discretization errors under control at about 5%. We obtain 88(4) MeV for hyperfine splitting using the $r_0$ scale, and 121(6) MeV using the ($1\bar{P}-1\bar{S}$) scale. This paper raises the possibility that the discrepancy between the lattice results and the experimental value for charmonium hyperfine splitting can be resolved using overlap fermions to simulate the charm quark on lattice. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('hep-lat/0507027v1-abstract-full').style.display = 'none'; document.getElementById('hep-lat/0507027v1-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 July, 2005; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> July 2005. </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, 9 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Report number:</span> UK/05-06 </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys.Lett.B638:55-60,2006 </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/0504005">arXiv:hep-lat/0504005</a> <span> [<a href="https://arxiv.org/pdf/hep-lat/0504005">pdf</a>, <a href="https://arxiv.org/ps/hep-lat/0504005">ps</a>, <a href="https://arxiv.org/format/hep-lat/0504005">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/10.1016/j.physletb.2005.04.076">10.1016/j.physletb.2005.04.076 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> The Negativity of the Overlap-Based Topological Charge Density Correlator in Pure-Glue QCD and the Non-Integrable Nature of its Contact Part </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-lat?searchtype=author&query=Horvath%2C+I">I. Horvath</a>, <a href="/search/hep-lat?searchtype=author&query=Alexandru%2C+A">A. Alexandru</a>, <a href="/search/hep-lat?searchtype=author&query=Zhang%2C+J+B">J. B. Zhang</a>, <a href="/search/hep-lat?searchtype=author&query=Chen%2C+Y">Y. Chen</a>, <a href="/search/hep-lat?searchtype=author&query=Dong%2C+S+J">S. J. Dong</a>, <a href="/search/hep-lat?searchtype=author&query=Draper%2C+T">T. Draper</a>, <a href="/search/hep-lat?searchtype=author&query=Liu%2C+K+F">K. F. Liu</a>, <a href="/search/hep-lat?searchtype=author&query=Mathur%2C+N">N. Mathur</a>, <a href="/search/hep-lat?searchtype=author&query=Tamhankar%2C+S">S. Tamhankar</a>, <a href="/search/hep-lat?searchtype=author&query=Thacker%2C+H+B">H. B. Thacker</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/0504005v1-abstract-short" style="display: inline;"> We calculate the lattice two-point function of topological charge density in pure-glue QCD using the discretization of the operator based on the overlap Dirac matrix. Utilizing data at three lattice spacings it is shown that the continuum limit of the correlator complies with the requirement of non-positivity at non-zero distances. For our choice of the overlap operator and the Iwasaki gauge act… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('hep-lat/0504005v1-abstract-full').style.display = 'inline'; document.getElementById('hep-lat/0504005v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="hep-lat/0504005v1-abstract-full" style="display: none;"> We calculate the lattice two-point function of topological charge density in pure-glue QCD using the discretization of the operator based on the overlap Dirac matrix. Utilizing data at three lattice spacings it is shown that the continuum limit of the correlator complies with the requirement of non-positivity at non-zero distances. For our choice of the overlap operator and the Iwasaki gauge action we find that the size of the positive core is ~2a (with a being the lattice spacing) sufficiently close to the continuum limit. This result confirms that the overlap-based topological charge density is a valid local operator over realistic backgrounds contributing to the QCD path integral, and is important for the consistency of recent results indicating the existence of a low-dimensional global brane-like topological structure in the QCD vacuum. We also confirm the divergent short-distance behavior of the correlator, and the non-integrable nature of the associated contact part. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('hep-lat/0504005v1-abstract-full').style.display = 'none'; document.getElementById('hep-lat/0504005v1-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 April, 2005; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> April 2005. </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, 5 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys.Lett.B617:49-59,2005 </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/0501025">arXiv:hep-lat/0501025</a> <span> [<a href="https://arxiv.org/pdf/hep-lat/0501025">pdf</a>, <a href="https://arxiv.org/ps/hep-lat/0501025">ps</a>, <a href="https://arxiv.org/format/hep-lat/0501025">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/10.1016/j.physletb.2005.03.004">10.1016/j.physletb.2005.03.004 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Inherently Global Nature of Topological Charge Fluctuations in QCD </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-lat?searchtype=author&query=Horvath%2C+I">I. Horvath</a>, <a href="/search/hep-lat?searchtype=author&query=Alexandru%2C+A">A. Alexandru</a>, <a href="/search/hep-lat?searchtype=author&query=Zhang%2C+J+B">J. B. Zhang</a>, <a href="/search/hep-lat?searchtype=author&query=Chen%2C+Y">Y. Chen</a>, <a href="/search/hep-lat?searchtype=author&query=Dong%2C+S+J">S. J. Dong</a>, <a href="/search/hep-lat?searchtype=author&query=Draper%2C+T">T. Draper</a>, <a href="/search/hep-lat?searchtype=author&query=Lee%2C+F+X">F. X. Lee</a>, <a href="/search/hep-lat?searchtype=author&query=Liu%2C+K+F">K. F. Liu</a>, <a href="/search/hep-lat?searchtype=author&query=Mathur%2C+N">N. Mathur</a>, <a href="/search/hep-lat?searchtype=author&query=Tamhankar%2C+S">S. Tamhankar</a>, <a href="/search/hep-lat?searchtype=author&query=Thacker%2C+H+B">H. B. Thacker</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/0501025v3-abstract-short" style="display: inline;"> We have recently presented evidence that in configurations dominating the regularized pure-glue QCD path integral, the topological charge density constructed from overlap Dirac operator organizes into an ordered space-time structure. It was pointed out that, among other properties, this structure exhibits two important features: it is low-dimensional and geometrically global, i.e. consisting of… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('hep-lat/0501025v3-abstract-full').style.display = 'inline'; document.getElementById('hep-lat/0501025v3-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="hep-lat/0501025v3-abstract-full" style="display: none;"> We have recently presented evidence that in configurations dominating the regularized pure-glue QCD path integral, the topological charge density constructed from overlap Dirac operator organizes into an ordered space-time structure. It was pointed out that, among other properties, this structure exhibits two important features: it is low-dimensional and geometrically global, i.e. consisting of connected sign-coherent regions with local dimensions 1<= d < 4, and spreading over arbitrarily large space--time distances. Here we show that the space-time structure that is responsible for the origin of topological susceptibility indeed exhibits global behavior. In particular, we show numerically that topological fluctuations are not saturated by localized concentrations of most intense topological charge density. To the contrary, the susceptibility saturates only after the space-time regions with most intense fields are included, such that geometrically global structure is already formed. We demonstrate this result both at the fundamental level (full topological density) and at low energy (effective density). The drastic mismatch between the point of fluctuation saturation (~ 50% of space-time at low energy) and that of global structure formation (<4% of space-time at low energy) indicates that the ordered space-time structure in topological charge is inherently global and that topological charge fluctuations in QCD cannot be understood in terms of individual localized pieces. Description in terms of global brane-like objects should be sought instead. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('hep-lat/0501025v3-abstract-full').style.display = 'none'; document.getElementById('hep-lat/0501025v3-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 February, 2005; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 26 January, 2005; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> January 2005. </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, 3 figures; v2: typos corrected, minor modifications; v3: misprint in Eqs. (2,3) fixed</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys.Lett.B612:21-28,2005 </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/0409128">arXiv:hep-lat/0409128</a> <span> [<a href="https://arxiv.org/pdf/hep-lat/0409128">pdf</a>, <a href="https://arxiv.org/ps/hep-lat/0409128">ps</a>, <a href="https://arxiv.org/format/hep-lat/0409128">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/10.1016/j.nuclphysbps.2004.11.253">10.1016/j.nuclphysbps.2004.11.253 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Charmonium Spectrum from Quenched QCD with Overlap Fermions </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-lat?searchtype=author&query=Tamhankar%2C+S">S. Tamhankar</a>, <a href="/search/hep-lat?searchtype=author&query=Alexandru%2C+A">A. Alexandru</a>, <a href="/search/hep-lat?searchtype=author&query=Chen%2C+Y">Y. Chen</a>, <a href="/search/hep-lat?searchtype=author&query=Dong%2C+S+J">S. J. Dong</a>, <a href="/search/hep-lat?searchtype=author&query=Draper%2C+T">T. Draper</a>, <a href="/search/hep-lat?searchtype=author&query=Horvath%2C+I">I. Horvath</a>, <a href="/search/hep-lat?searchtype=author&query=Lee%2C+F+X">F. X. Lee</a>, <a href="/search/hep-lat?searchtype=author&query=Liu%2C+K+F">K. F. Liu</a>, <a href="/search/hep-lat?searchtype=author&query=Mathur%2C+N">N. Mathur</a>, <a href="/search/hep-lat?searchtype=author&query=Zhang%2C+J+B">J. B. Zhang</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/0409128v1-abstract-short" style="display: inline;"> We present preliminary results using overlap fermions for the charmonium spectrum, in particular for hyperfine splitting. Simulations are performed on $16^3 \times 72$ lattices, with Wilson gauge action at $尾=6.3345$. Depending on how the scale is set, we obtain 104(5) MeV (using $1\bar{P}-1\bar{S}$) or 88(4) MeV (using $r_0$=0.5 fm) for the hyperfine splitting. </span> <span class="abstract-full has-text-grey-dark mathjax" id="hep-lat/0409128v1-abstract-full" style="display: none;"> We present preliminary results using overlap fermions for the charmonium spectrum, in particular for hyperfine splitting. Simulations are performed on $16^3 \times 72$ lattices, with Wilson gauge action at $尾=6.3345$. Depending on how the scale is set, we obtain 104(5) MeV (using $1\bar{P}-1\bar{S}$) or 88(4) MeV (using $r_0$=0.5 fm) for the hyperfine splitting. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('hep-lat/0409128v1-abstract-full').style.display = 'none'; document.getElementById('hep-lat/0409128v1-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 September, 2004; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> September 2004. </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">3 pages, 5 fiugres. Talk presented at Lattice 2004 (heavy)</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Nucl.Phys.Proc.Suppl.140:434-436,2005 </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/0408006">arXiv:hep-lat/0408006</a> <span> [<a href="https://arxiv.org/pdf/hep-lat/0408006">pdf</a>, <a href="https://arxiv.org/ps/hep-lat/0408006">ps</a>, <a href="https://arxiv.org/format/hep-lat/0408006">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/10.1016/j.nuclphysbps.2004.11.339">10.1016/j.nuclphysbps.2004.11.339 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Improved Measure of Local Chirality </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-lat?searchtype=author&query=Draper%2C+T">Terrence Draper</a>, <a href="/search/hep-lat?searchtype=author&query=Alexandru%2C+A">Andrei Alexandru</a>, <a href="/search/hep-lat?searchtype=author&query=Chen%2C+Y">Ying Chen</a>, <a href="/search/hep-lat?searchtype=author&query=Dong%2C+S">Shao-Jing Dong</a>, <a href="/search/hep-lat?searchtype=author&query=Horvath%2C+I">Ivan Horvath</a>, <a href="/search/hep-lat?searchtype=author&query=Lee%2C+F">Frank Lee</a>, <a href="/search/hep-lat?searchtype=author&query=Mathur%2C+N">Nilmani Mathur</a>, <a href="/search/hep-lat?searchtype=author&query=Thacker%2C+H+B">Harry B. Thacker</a>, <a href="/search/hep-lat?searchtype=author&query=Tamhankar%2C+S">Sonali Tamhankar</a>, <a href="/search/hep-lat?searchtype=author&query=Zhang%2C+J">Jianbo Zhang</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/0408006v1-abstract-short" style="display: inline;"> It is popular to probe the structure of the QCD vacuum indirectly by studying individual fermion eigenmodes, because this provides a natural way to filter out UV fluctuations. The double-peaking in the distribution of the local chiral orientation parameter (X) has been offered as evidence, by some, in support of a particular model of the vacuum. Here we caution that the X-distribution peaking va… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('hep-lat/0408006v1-abstract-full').style.display = 'inline'; document.getElementById('hep-lat/0408006v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="hep-lat/0408006v1-abstract-full" style="display: none;"> It is popular to probe the structure of the QCD vacuum indirectly by studying individual fermion eigenmodes, because this provides a natural way to filter out UV fluctuations. The double-peaking in the distribution of the local chiral orientation parameter (X) has been offered as evidence, by some, in support of a particular model of the vacuum. Here we caution that the X-distribution peaking varies significantly with various versions of the definition of X. Furthermore, each distribution varies little from that resulting from a random reshuffling of the left-handed (and independently the right-handed) fields, which destroys any QCD-induced left-right correlation; that is, the double-peaking is mostly a phase-space effect. We propose a new universal definition of the X parameter whose distribution is uniform for randomly reshuffled fields. Any deviations from uniformity for actual data can then be directly attributable to QCD-induced dynamics. We find that the familiar double peak disappears. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('hep-lat/0408006v1-abstract-full').style.display = 'none'; document.getElementById('hep-lat/0408006v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 4 August, 2004; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> August 2004. </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">Lattice 2004(topology), Fermilab, June 21-26, 2004; 3 pages, 4 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Report number:</span> UK/04-19 </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Nucl.Phys.Proc.Suppl.140:623-625,2005 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/hep-ph/0406196">arXiv:hep-ph/0406196</a> <span> [<a href="https://arxiv.org/pdf/hep-ph/0406196">pdf</a>, <a href="https://arxiv.org/ps/hep-ph/0406196">ps</a>, <a href="https://arxiv.org/format/hep-ph/0406196">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/10.1103/PhysRevD.70.074508">10.1103/PhysRevD.70.074508 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> A study of pentaquarks on the lattice with overlap fermions </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-lat?searchtype=author&query=Mathur%2C+N">N. Mathur</a>, <a href="/search/hep-lat?searchtype=author&query=Lee%2C+F+X">F. X. Lee</a>, <a href="/search/hep-lat?searchtype=author&query=Alexandru%2C+A">A. Alexandru</a>, <a href="/search/hep-lat?searchtype=author&query=Bennhold%2C+C">C. Bennhold</a>, <a href="/search/hep-lat?searchtype=author&query=Chen%2C+Y">Y. Chen</a>, <a href="/search/hep-lat?searchtype=author&query=Dong%2C+S+J">S. J. Dong</a>, <a href="/search/hep-lat?searchtype=author&query=Draper%2C+T">T. Draper</a>, <a href="/search/hep-lat?searchtype=author&query=Horvath%2C+I">I. Horvath</a>, <a href="/search/hep-lat?searchtype=author&query=Liu%2C+K+F">K. F. Liu</a>, <a href="/search/hep-lat?searchtype=author&query=Tamhankar%2C+S">S. Tamhankar</a>, <a href="/search/hep-lat?searchtype=author&query=Zhang%2C+J+B">J. B. Zhang</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-ph/0406196v3-abstract-short" style="display: inline;"> We present a quenched lattice QCD calculation of spin-1/2 five-quark states with $uudd\bar{s}$ quark content for both positive and negative parities. We do not observe any bound pentaquark state in these channels for either I = 0 or I =1. The states we found are consistent with KN scattering states which are checked to exhibit the expected volume dependence of the spectral weight. The results ar… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('hep-ph/0406196v3-abstract-full').style.display = 'inline'; document.getElementById('hep-ph/0406196v3-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="hep-ph/0406196v3-abstract-full" style="display: none;"> We present a quenched lattice QCD calculation of spin-1/2 five-quark states with $uudd\bar{s}$ quark content for both positive and negative parities. We do not observe any bound pentaquark state in these channels for either I = 0 or I =1. The states we found are consistent with KN scattering states which are checked to exhibit the expected volume dependence of the spectral weight. The results are based on overlap-fermion propagators on two lattices, 12^3 x 28 and 16^3 x 28, with the same lattice spacing of 0.2 fm, and pion mass as low as ~ 180 MeV. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('hep-ph/0406196v3-abstract-full').style.display = 'none'; document.getElementById('hep-ph/0406196v3-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 September, 2004; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 17 June, 2004; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> June 2004. </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">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> UK/04-13 </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys.Rev.D70:074508,2004 </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/0405001">arXiv:hep-lat/0405001</a> <span> [<a href="https://arxiv.org/pdf/hep-lat/0405001">pdf</a>, <a href="https://arxiv.org/ps/hep-lat/0405001">ps</a>, <a href="https://arxiv.org/format/hep-lat/0405001">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 Sequential Empirical Bayes Method: An Adaptive Constrained-Curve Fitting Algorithm for Lattice QCD </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-lat?searchtype=author&query=Chen%2C+Y">Ying Chen</a>, <a href="/search/hep-lat?searchtype=author&query=Dong%2C+S">Shao-Jing Dong</a>, <a href="/search/hep-lat?searchtype=author&query=Draper%2C+T">Terrence Draper</a>, <a href="/search/hep-lat?searchtype=author&query=Horvath%2C+I">Ivan Horvath</a>, <a href="/search/hep-lat?searchtype=author&query=Liu%2C+K">Keh-Fei Liu</a>, <a href="/search/hep-lat?searchtype=author&query=Mathur%2C+N">Nilmani Mathur</a>, <a href="/search/hep-lat?searchtype=author&query=Tamhankar%2C+S">Sonali Tamhankar</a>, <a href="/search/hep-lat?searchtype=author&query=Srinivasan%2C+C">Cidambi Srinivasan</a>, <a href="/search/hep-lat?searchtype=author&query=Lee%2C+F+X">Frank X. Lee</a>, <a href="/search/hep-lat?searchtype=author&query=Zhang%2C+J">Jianbo Zhang</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/0405001v1-abstract-short" style="display: inline;"> We introduce the ``Sequential Empirical Bayes Method'', an adaptive constrained-curve fitting procedure for extracting reliable priors. These are then used in standard augmented-$蠂^2$ fits on separate data. This better stabilizes fits to lattice QCD overlap-fermion data at very low quark mass where {\it a priori} values are not otherwise known. Lessons learned (including caveats limiting the sco… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('hep-lat/0405001v1-abstract-full').style.display = 'inline'; document.getElementById('hep-lat/0405001v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="hep-lat/0405001v1-abstract-full" style="display: none;"> We introduce the ``Sequential Empirical Bayes Method'', an adaptive constrained-curve fitting procedure for extracting reliable priors. These are then used in standard augmented-$蠂^2$ fits on separate data. This better stabilizes fits to lattice QCD overlap-fermion data at very low quark mass where {\it a priori} values are not otherwise known. Lessons learned (including caveats limiting the scope of the method) from studying artificial data are presented. As an illustration, from local-local two-point correlation functions, we obtain masses and spectral weights for ground and first-excited states of the pion, give preliminary fits for the $a_0$ where ghost states (a quenched artifact) must be dealt with, and elaborate on the details of fits of the Roper resonance and $S_{11}(N^{1/2-})$ previously presented elsewhere. The data are from overlap fermions on a quenched $16^3\times 28$ lattice with spatial size $La=3.2 {\rm fm}$ and pion mass as low as $\sim 180 {\rm MeV}$. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('hep-lat/0405001v1-abstract-full').style.display = 'none'; document.getElementById('hep-lat/0405001v1-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 May, 2004; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> May 2004. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">37 pages, 16 figures, uses apsrev.bst</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Report number:</span> UK/04-10 </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/0310013">arXiv:hep-lat/0310013</a> <span> [<a href="https://arxiv.org/pdf/hep-lat/0310013">pdf</a>, <a href="https://arxiv.org/ps/hep-lat/0310013">ps</a>, <a href="https://arxiv.org/format/hep-lat/0310013">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/10.1016/S0920-5632(03)02530-1">10.1016/S0920-5632(03)02530-1 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Glueball Matrix Elements on Anisotropic Lattices </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-lat?searchtype=author&query=Chen%2C+Y">Y. Chen</a>, <a href="/search/hep-lat?searchtype=author&query=Dong%2C+S+-">S. -J. Dong</a>, <a href="/search/hep-lat?searchtype=author&query=Draper%2C+T">T. Draper</a>, <a href="/search/hep-lat?searchtype=author&query=Horvath%2C+I">I. Horvath</a>, <a href="/search/hep-lat?searchtype=author&query=Lee%2C+F+-">F. -X. Lee</a>, <a href="/search/hep-lat?searchtype=author&query=Mathur%2C+N">N. Mathur</a>, <a href="/search/hep-lat?searchtype=author&query=Morningstar%2C+C">C. Morningstar</a>, <a href="/search/hep-lat?searchtype=author&query=Peardon%2C+M">M. Peardon</a>, <a href="/search/hep-lat?searchtype=author&query=Tamhankar%2C+S">S. Tamhankar</a>, <a href="/search/hep-lat?searchtype=author&query=Young%2C+B+L">B. L. Young</a>, <a href="/search/hep-lat?searchtype=author&query=Zhang%2C+J+-">J. -B. Zhang</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/0310013v1-abstract-short" style="display: inline;"> The glueball-to-vacuum matrix elements of local gluonic operators in scalar, tensor, and pseudoscalar channels are investigated numerically on several anisotropic lattices with the spatial lattice spacing in the range 0.1fm -- 0.2fm. These matrix elements are needed to predict the glueball branching ratios in $J/蠄$ radiative decays which will help to identify the glueball states in experiments.… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('hep-lat/0310013v1-abstract-full').style.display = 'inline'; document.getElementById('hep-lat/0310013v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="hep-lat/0310013v1-abstract-full" style="display: none;"> The glueball-to-vacuum matrix elements of local gluonic operators in scalar, tensor, and pseudoscalar channels are investigated numerically on several anisotropic lattices with the spatial lattice spacing in the range 0.1fm -- 0.2fm. These matrix elements are needed to predict the glueball branching ratios in $J/蠄$ radiative decays which will help to identify the glueball states in experiments. Two types of improved local gluonic operators are constructed for a self-consistent check, and the finite volume effects are also studied. The lattice spacing dependence of our results is very small and the continuum limits are reliably extrapolated. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('hep-lat/0310013v1-abstract-full').style.display = 'none'; document.getElementById('hep-lat/0310013v1-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, 2003; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> October 2003. </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">3 pages, 3 figures, Lattice2003 (spectrum)</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Report number:</span> UK-03-13 </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Nucl.Phys.Proc.Suppl.129:203-205,2004 </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/0301022">arXiv:hep-lat/0301022</a> <span> [<a href="https://arxiv.org/pdf/hep-lat/0301022">pdf</a>, <a href="https://arxiv.org/ps/hep-lat/0301022">ps</a>, <a href="https://arxiv.org/format/hep-lat/0301022">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/10.1016/S0920-5632(03)01612-8">10.1016/S0920-5632(03)01612-8 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> A lattice study of $螞_b$ semileptonic decay </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-lat?searchtype=author&query=Gottlieb%2C+S">Steven Gottlieb</a>, <a href="/search/hep-lat?searchtype=author&query=Tamhankar%2C+S">Sonali Tamhankar</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/0301022v1-abstract-short" style="display: inline;"> We present results from a lattice study of the semileptonic decay $螞_b \to 螞_c l 谓_l $. We use $O(a^2, 伪_s a^2)$ improved quenched lattices of the MILC collaboration, with lattice spacing $\sim 0.13$ fm. For the valence quarks, the tadpole-improved clover action is used, with the Fermilab method employed for the heavy quarks. Form factors are extracted from the vector as well as the axial-vector… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('hep-lat/0301022v1-abstract-full').style.display = 'inline'; document.getElementById('hep-lat/0301022v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="hep-lat/0301022v1-abstract-full" style="display: none;"> We present results from a lattice study of the semileptonic decay $螞_b \to 螞_c l 谓_l $. We use $O(a^2, 伪_s a^2)$ improved quenched lattices of the MILC collaboration, with lattice spacing $\sim 0.13$ fm. For the valence quarks, the tadpole-improved clover action is used, with the Fermilab method employed for the heavy quarks. Form factors are extracted from the vector as well as the axial-vector part of the current. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('hep-lat/0301022v1-abstract-full').style.display = 'none'; document.getElementById('hep-lat/0301022v1-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, 2003; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> January 2003. </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">3 pages, 7 figures, Lattice2002(heavyquark)</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Nucl.Phys.Proc.Suppl.119:644-646,2003 </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/0011037">arXiv:hep-lat/0011037</a> <span> [<a href="https://arxiv.org/pdf/hep-lat/0011037">pdf</a>, <a href="https://arxiv.org/ps/hep-lat/0011037">ps</a>, <a href="https://arxiv.org/format/hep-lat/0011037">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/10.1016/S0920-5632(01)01016-7">10.1016/S0920-5632(01)01016-7 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Benchmarking MILC code with OpenMP and MPI </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-lat?searchtype=author&query=Gottlieb%2C+S">Steven Gottlieb</a>, <a href="/search/hep-lat?searchtype=author&query=Tamhankar%2C+S">Sonali Tamhankar</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/0011037v1-abstract-short" style="display: inline;"> A trend in high performance computers that is becoming increasingly popular is the use of symmetric multiprocessing (SMP) rather than the older paradigm of MPP. MPI codes that ran and scaled well on MPP machines can often be run on an SMP machine using the vendor's version of MPI. However, this approach may not make optimal use of the (expensive) SMP hardware. More significantly, there are machi… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('hep-lat/0011037v1-abstract-full').style.display = 'inline'; document.getElementById('hep-lat/0011037v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="hep-lat/0011037v1-abstract-full" style="display: none;"> A trend in high performance computers that is becoming increasingly popular is the use of symmetric multiprocessing (SMP) rather than the older paradigm of MPP. MPI codes that ran and scaled well on MPP machines can often be run on an SMP machine using the vendor's version of MPI. However, this approach may not make optimal use of the (expensive) SMP hardware. More significantly, there are machines like Blue Horizon, an IBM SP with 8-way SMP nodes at the San Diego Supercomputer Center that can only support 4 MPI processes per node (with the current switch). On such a machine it is imperative to be able to use OpenMP parallelism on the node, and MPI between nodes. We describe the challenges of converting MILC MPI code to using a second level of OpenMP parallelism, and benchmarks on IBM and Sun computers. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('hep-lat/0011037v1-abstract-full').style.display = 'none'; document.getElementById('hep-lat/0011037v1-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> 6 November, 2000; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> November 2000. </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">Lattice 2000 (Computers), 5 pages, 3 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Nucl.Phys.Proc.Suppl. 94 (2001) 841-845 </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/9909118">arXiv:hep-lat/9909118</a> <span> [<a href="https://arxiv.org/pdf/hep-lat/9909118">pdf</a>, <a href="https://arxiv.org/ps/hep-lat/9909118">ps</a>, <a href="https://arxiv.org/format/hep-lat/9909118">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/10.1016/S0920-5632(00)91626-8">10.1016/S0920-5632(00)91626-8 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Scale Determination Using the Static Potential with Two Dynamical Quark Flavors </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-lat?searchtype=author&query=Tamhankar%2C+S">Sonali Tamhankar</a>, <a href="/search/hep-lat?searchtype=author&query=Gottlieb%2C+S">Steven Gottlieb</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/9909118v1-abstract-short" style="display: inline;"> We study the static potential using gauge configurations that include the effects of two flavors of dynamical Kogut-Susskind quarks. The configurations, generated by the MILC collaboration, and used to study the spectrum and heavy-light decay constants, cover a range $5.3 \le 6/g^2 \le 5.6$. There are at least four quark masses for each coupling studied. Determination of $r_0$ from the potential… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('hep-lat/9909118v1-abstract-full').style.display = 'inline'; document.getElementById('hep-lat/9909118v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="hep-lat/9909118v1-abstract-full" style="display: none;"> We study the static potential using gauge configurations that include the effects of two flavors of dynamical Kogut-Susskind quarks. The configurations, generated by the MILC collaboration, and used to study the spectrum and heavy-light decay constants, cover a range $5.3 \le 6/g^2 \le 5.6$. There are at least four quark masses for each coupling studied. Determination of $r_0$ from the potential can be used to set a scale. This alternative scale is useful to study systematic errors on the spectrum and decay constants. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('hep-lat/9909118v1-abstract-full').style.display = 'none'; document.getElementById('hep-lat/9909118v1-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 September, 1999; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> September 1999. </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">LATTICE99(spectrum) - 3 pages, 4 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Nucl.Phys.Proc.Suppl. 83 (2000) 212-214 </p> </li> </ol> <div class="is-hidden-tablet">  <span class="help" 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