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 $m_{\mathrm{PS}}/m_{\mathrm{V}}\approx 0.8$--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 $m_{ud}^{\overline{MS}}(2GeV)=3.44_{-0.22}^{+0.14}$ MeV and $m_s^{\overline{MS}}(2GeV)=88_{-6}^{+4}$ MeV ($K$-input) and $m_s^{\overline{MS}}(2GeV)=90_{-11}^{+5}$ MeV ($\ddot{I}•$-input), which are reduced by about 25% compared to the values in quenched QCD.

Lattice 2000 (Spectrum), 4 pages, 3 figures