Physics – High Energy Physics – High Energy Physics - Lattice
Scientific paper
1999-02-12
Phys.Rev.D60:114508,1999
Physics
High Energy Physics
High Energy Physics - Lattice
LaTeX, 35 pages, 22 eps figures, uses revtex and epsf
Scientific paper
10.1103/PhysRevD.60.114508
We investigate effects of action improvement on the light hadron spectrum and the static quark potential in two-flavor QCD for $a^{-1} \approx 1$ GeV and $m_{PS}/m_V = 0.7-0.9$. We compare a renormalization group improved action with the plaquette action for gluons, and the SW-clover action with the Wilson action for quarks. We find a significant improvement in the hadron spectrum by improving the quark action, while the gluon improvement is crucial for a rotationally invariant static potential. We also explore the region of light quark masses corresponding to $m_{PS}/m_V \geq 0.4$ on a 2.7 fm lattice using the improved gauge and quark action. A flattening of the potential is not observed up to 2 fm.
Aoki CP-PACS-Collaboration: S.
Boyd Graham
Burkhalter Rudolf
Hashimoto Shigehira
Ishizuka Naruhito
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