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

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

2002-09-05

arxiv.org/abs/hep-lat/0209073v3

Physics

High Energy Physics

High Energy Physics - Lattice

3 pages, 4 figures, Lattice2002(spectrum)

Scientific paper

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 $12^3 \times 24$ and $16^3 \times 24$ 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 $\Delta\tau$. Nature of the spike is studied. We also study finite-size effects and chiral properties of meson masses.

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