Full QCD light hadron spectrum and quark masses: Final results from CP-PACS

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 mPS/mV ≈ 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 MS ud (2GeV) = 3.44+0.140.22 MeV and m MS s (2GeV) = 88+4−6 MeV (K-input) and m MS s(2GeV) = 90+5−11 MeV (φ-input), which are reduced by about 25% compared to the values in quenched QCD.