Thu·Sep 1, 2005Thursday·September 1, 2005

1. 01*

   Nonperturbative $O(a)$ improvement of the Wilson quark action with the RG-improved gauge action using the Schrödinger functional method

   CP-PACS · JLQCD Collaborations: S. Aoki · M. Fukugita · S. Hashimoto · K-I. Ishikawa · N. Ishizuka · Y. Iwasaki · K. Kanaya · T. Kaneko · Y. Kuramashi · M. Okawa · S. Takeda and 5 other authors

   We perform a nonperturbative determination of the $O(a)$-improvement coefficient $c_{\mathrm{SW}}$ and the critical hopping parameter ${\kappa }_c$ for $N_f$=3, 2, 0 flavor QCD with the RG-improved gauge action using the Schrödinger functional method. In order to interpolate $c_{\mathrm{SW}}$ and ${\kappa }_c$ as a function of the bare coupling, a wide range of $\beta$ from the weak coupling region to the moderately strong coupling points used in large-scale simulations is studied. Corrections at finite lattice size of $O(a/L)$ turned out to be large for the RG-improved gauge action, and hence we make the determination at a size fixed in physical units using a modified improvement condition. This enables us to avoid $O(a)$ scaling violations which would remain in physical observables if $c_{\mathrm{SW}}$ determined for a fixed lattice size $L/a$ is used in numerical simulations.

   hep-latPRD(2006)·110 citations
2. 02*

   Phase structures of strong coupling lattice QCD with overlap fermions at finite temperature and chemical potential

   Xiao-Lu Yu🇨🇳 · Xiang-Qian Luo (Zhongshan Univ.)🇨🇳

   We perform the first study of lattice QCD with overlap fermions at finite temperature $T$ and chemical potential $\mu$. We start from the Taylor expanded overlap fermion action, and derive in the strong coupling limit the effective free energy by mean field approximation. On the ($\mu ,T$) plane and in the chiral limit, there is a tricritical point, separating the second order chiral phase transition line at small $\mu$ and large $T$, and first order chiral phase transition line at large $\mu$ and small $T$.

   hep-latMod.Phys.Lett.A(2007)·7 citations
3. 03*

   The effect of sea quarks on the mass of the charm quark from Lattice QCD

   A. Dougall🇬🇧 · C. M. Maynard🇬🇧 · C. McNeile🇬🇧

   We compute the mass of the charm quark using both quenched and dynamical lattice QCD calculations. We examine the effects of mass dependent lattice artifacts by comparing two different formalisms for the heavy quarks. We take the continuum limit of the charm mass in quenched QCD by extrapolating from three different lattice spacings. At a fixed lattice spacing, the mass of the charm quark is compared between quenched QCD and dynamical QCD with a sea quark mass around strange. In the continuum limit of quenched QCD, we find m_c(m_c)=1.29(7)(13) GeV. No evidence was seen for unquenching.

   hep-latJHEP(2006)·7 citations
4. 04*

   Low Energy Constants from the zero mode contribution to the pseudo-scalar correlator

   S. Shcheredin🇩🇪 · W. Bietenholz🇩🇪

   We apply different types of overlap operators in quenched QCD simulations to compute the zero mode contribution to the pseudo-scalar correlator. In particular we use the conventional Neuberger Dirac operator and the overlap hypercube Dirac operator. Confronting our data with the analytical predictions by Chiral Perturbation Theory we evaluate the pion decay constant and the parameter \alpha of the quenched chiral Lagrangian.

   hep-latPoS(2006)·11 citations
5. 05*

   Lattice Chirality and its uses at large N

   Rajamani Narayanan (FIU)🇺🇸 · Herbert Neuberger (Rutgers)🇺🇸

   A brief overview of the authors' work on lattice chirality and its application to the numerical study of planar QCD is presented.

   hep-latInt.J.Mod.Phys.A(2006)·1 citation

* 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.