Exploring QCD at small sea quark masses with improved Wilson-type quarks
062_0209073.pdf 365 KB
Lesk, V. I.
We explore the region of small sea quark masses belowmps/mv= 0.5 in two-flavor QCD using a mean-field improved clover quark action and an RG-improved gauge action ata 0.2 fm on 123 × 24 and 163 × 24 lattices. We find that instability of the standard BiCGStab algorithm at small quark masses can be mostly removed by the BiCGStab(DS-L) algorithm, which employsL-th minimal residual polynomials with a dynamical selection ofL. We also find singular spikes of ΔH in the HMC algorithm at moderate values of Δτ. Nature of the spike is studied. We also study finite-size effects and chiral properties of meson masses.
Nuclear Physics B Proceedings Supplements
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Elsevier Science B.V.
Copyright (c) 2003 Elsevier Science B.V.
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Graduate School of Science