HEP Lattice·hep-lat
5 papers—5 primary·0 cross-listed·reconstructed*
I discuss recent developments in lattice QCD thermodynamics on the nature of the transition at finite temperature and density, equation of state, screening of static charges and meson spectral functions at high temperatures.
Emel Gulez · Junko Shigemitsu🇺🇸 · Matthew Wingate🇺🇸
One-loop matching of heavy-light currents is carried out for a highly improved lattice action, including the effects of mixings with dimension 4 O(1/M) and O(a) operators. We use the NRQCD action for heavy quarks, the Asqtad improved naive action for light quarks, and the Symanzik improved glue action. These results are being used in recent heavy meson decay constant and semileptonic form factor calculations on the MILC dynamical configurations.
The effect of repeatedly smearing SU(3) gauge configurations is investigated. Six gauge actions (Wilson, Symanzik, Iwasaki, DBW2, Beinlich-Karsch-Laermann, Langfeld; combined with a direct SU(3)-overrelaxation step) and three smearings (APE, HYP, EXP) are compared. The impact on large Wilson loops is monitored, confirming the signal-to-noise prediction by Lepage. The fat-link definition of the ``naive'' topological charge proves most useful on improved action ensembles.
I. Wetzorke🇩🇪 · K. Jansen🇩🇪 · F. Palombi🇮🇹 · A. Shindler🇩🇪
We report on recent results for the pion and nucleon matrix element of the twist-2 operator corresponding to the average momentum of non-singlet quark densities. We discuss finite size effects for the nucleon matrix element and present first preliminary results for the non-perturbative renormalisation from full dynamical simulations.
L. Levkova🇺🇸 · R. Mawhinney🇺🇸
The DWF formulation becomes increasingly problematic at gauge couplings for which GeV, where the roughness of the gauge field leads to increased explicit chiral symmetry breaking (). This problem becomes especially severe for sufficiently strong coupling where the underlying 4-dimensional Wilson theory is in the Aoki phase. We review our attempts to find a suitable modification of the gauge and/or the fermion action which would allow the DWF method to work reliably at stronger coupling.
* Reconstructed cohort: no mailing for this day survives in the archive. Papers are grouped by their submission times and arXiv's announcement cut-off, assuming announcement without delay; positions follow identifier order. Validated at ~91% exact-day agreement against the archived era.