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Exploring QCD at small sea quark masses with improved Wilson-type quarks

✍ Scribed by 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. Yoshie´

Publisher
Elsevier Science
Year
2003
Tongue
English
Weight
269 KB
Volume
119
Category
Article
ISSN
0920-5632

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✦ Synopsis

We explore the region of small sea quark masses below mps/mv = 0.5 in two-flavor QCD using a mean-field improved clover quark action and an RG-improved gauge action at a N 0.2 fm on 12" x 24 and 1G3 x 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 AH in the HMC algorithm at moderate values of AT. Nature of the spike is studied. We also study finite-size effects and chiral properties of meson masses. Y Namekawa et al./Nuclear Physics B (Proc. Suppl.) 119 (2003) 335-337

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