270 research outputs found
Exploring QCD at small sea quark masses with improved Wilson-type quarks
We explore the region of small sea quark masses below in
two-flavor QCD using a mean-field improved clover quark action and an
RG-improved gauge action at fm on and lattices. We find that instability of the standard BiCGStab
algorithm at small quark masses can be mostly removed by the BiCGStab(DS-)
algorithm, which employs -th minimal residual polynomials with a dynamical
selection of . We also find singular spikes of in the HMC
algorithm at moderate values of . Nature of the spike is studied.
We also study finite-size effects and chiral properties of meson masses.Comment: 3 pages, 4 figures, Lattice2002(spectrum
Dynamical fermions on anisotropic lattices
We report on our study of two-flavor full QCD on anisotropic lattices using
-improved Wilson quarks coupled with an RG-improved glue. The bare gauge
and quark anisotropies corresponding to the renormalized anisotropy
are determined as functions of and , using
the Wilson loop and the meson dispersion relation at several lattice cutoffs
and quark masses.Comment: Lattice2002(improve), 3 pages, 3 figure
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