arXiv:hep-lat/0010078·v1·High Energy Physics — Lattice

Full QCD Light Hadron Spectrum and Quark Masses: Final Results from CP-PACS

CP-PACS Collaboration: A. Ali Khan🇯🇵 · S. Aoki🇯🇵 · G. Boyd🇯🇵 · R. Burkhalter🇯🇵 · S. Ejiri🇯🇵 · M. Fukugita🇯🇵 · S. Hashimoto🇯🇵 · N. Ishizuka🇯🇵 · Y. Iwasaki🇯🇵 · K. Kanaya🇯🇵 · T. Kaneko🇯🇵 · Y. Kuramashi🇯🇵

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Abstract

We present the final results of the CP-PACS calculation of the light hadron spectrum and quark masses with two flavors of dynamical quarks. Simulations are made with a renormalization-group improved gauge action and a mean-field improved clover quark action for sea quark masses corresponding to $m_{PS} / m_{V} \approx 0.8$ --0.6 and the lattice spacing $a = 0.22$ --0.11 fm. For the meson spectrum in the continuum limit a clearly improved agreement with experiment is observed compared to the quenched case, demonstrating the importance of sea quark effects. For light quark masses we obtain $m_{u d}^{M S ˉ} (2 G e V) = 3.4 4_{- 0.22}^{+ 0.14}$ MeV and $m_{s}^{M S ˉ} (2 G e V) = 8 8_{- 6}^{+ 4}$ MeV ( $K$ -input) and $m_{s}^{M S ˉ} (2 G e V) = 9 0_{- 11}^{+ 5}$ MeV ( $ϕ$ -input), which are reduced by about 25% compared to the values in quenched QCD.