Fri·Nov 2, 2007Friday·November 2, 2007

1. 01*

   Baryon masses with improved staggered quarks

   C. Bernard🇺🇸 · C. Davies🇬🇧 · C. DeTar🇺🇸 · Steven Gottlieb🇺🇸 · U.M. Heller🇺🇸 · J.E. Hetrick🇺🇸 · L. Levkova🇺🇸 · J. Osborn🇺🇸 · D.B. Renner🇺🇸 · R. Sugar🇺🇸 · D. Toussaint🇺🇸

   The MILC collaboration's simulations with improved staggered quarks are being extended with runs at a lattice spacing of 0.06 fm with quark masses down to one tenth the strange quark mass. We give a brief introduction to these new simulations and the determination of the lattice spacing. Then we combine these new runs with older results to study the masses of the nucleon and the Omega minus in the continuum and chiral limits.

   hep-latPoS(2007)·8 citations
2. 02*

   On the phase diagram of QCD at finite isospin density

   Ph. de Forcrand🇨🇭 · M. A. Stephanov🇺🇸 · U. Wenger🇨🇭

   Using a canonical formalism, we determine the equation of state and the phase diagram of eight-flavour QCD, as a function of temperature and isospin density. Two mechanisms are at work: Bose condensation of pions at high density, and deconfinement at high temperature. We study their interplay and find that on our small and coarse lattice the first order deconfinement transition appears to end at a critical point at finite density. We investigate the strength of the overlap and of the sign problems and discuss implications for the baryonic density case.

   hep-lathep-phPoS(2007)·99 citations
3. 03*

   QCD finite T transition -- Comparison between Wilson and staggered results

   Yasumichi Aoki (1)🇺🇸 · Zoltan Fodor (2 and 3)🇩🇪 · Sandor D. Katz (2 and 3)🇭🇺 · Kalman K. Szabo (2)🇩🇪 · Balint C. Toth (3) ((1) Brookhaven National Laboratory, (2) University of Wuppertal, (3) Eotvos University)🇭🇺

   A quantitative comparison between the finite temperature behaviour of the staggered and Wilson fermion formulations are performed. The comparison is based on a physical quantity that is expected to be quite sensitive to the fermionic features of the action. For that purpose we use the height of the peak for $d{\chi }_s/dT$, where ${\chi }_s$ is the quark number susceptibility.

   hep-latPoS(2007)·2 citations
4. 04*

   Finite-volume Correction to the Pion Decay Constant in the Epsilon-Regime

   Poul H. Damgaard🇩🇰 · Thomas DeGrand🇺🇸 · Hidenori Fukaya🇩🇰

   In the chiral limit of QCD, the pion decay constant F can be extracted from lattice gauge theory by means of a coupling to isospin chemical potential. Here we compute the leading correction due to finite volume in the epsilon-expansion of chiral perturbation theory. A comparison is made to recent Monte Carlo data.

   hep-latJHEP(2007)·18 citations

* 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.