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19 April 2024

» arxiv » hep-lat/0209073

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Exploring QCD at small sea quark masses with improved Wilson-type quarks
CP-PACS Collaboration: Y. Namekawa ; S. Aoki ; M. Fukugita ; K-I. Ishikawa ; N. Ishizuka ; Y. Iwasaki ; K. Kanaya ; T. Kaneko ; Y. Kuramashi ; V.I. Lesk ; M. Okawa ; Y. Taniguchi ; A. Ukawa ; T. Umeda ; T. Yoshié ;
Date:	5 Sep 2002
Subject:	hep-lat
Abstract:	We explore the region of small sea quark masses below $m_{PS}/m_V=0.5$ in two-flavor QCD using a mean-field improved clover quark action and an RG-improved gauge action at $a simeq 0.2$ fm on $12^3 imes 24$ and $16^3 imes 24$ 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 employs $L$-th minimal residual polynomials with a dynamical selection of $L$. We also find singular spikes of $Delta H$ in the HMC algorithm at moderate values of $Delta au$. Nature of the spike is studied. We also study finite-size effects and chiral properties of meson masses.
Source:	arXiv, hep-lat/0209073
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