Hadron masses in QCD with two flavors of dynamical fermions at β=5.7

Abstract

A hadron mass calculation is reported using two flavors of dynamical, staggered fermions with masses of ma=0.01, 0.015, 0.02, and 0.025 on a ${16}^{3}$\ifmmode\times\else\texttimes\fi{}32 lattice. The masses of hadrons containing valence quarks with ma=0.004, 0.07, 0.1, 0.14, and 0.25 were also computed to study the limit ma\ensuremath{\rightarrow}0 and the strange particle spectrum. For ma=0.01, the mass ratio ${\mathit{m}}_{\mathit{N}}$/${\mathit{m}}_{\mathrm{\ensuremath{\rho}}}$=1.527(11) is 25% larger than experiment while the results ${\mathit{f}}_{\mathrm{\ensuremath{\pi}}}$/${\mathit{m}}_{\mathrm{\ensuremath{\rho}}}$=0.14(1) and (${\mathit{m}}_{\mathit{K}}^{2}$-${\mathit{m}}_{\mathrm{\ensuremath{\pi}}}^{2}$)/(${\mathit{m}}_{\mathit{K}}^{\mathrm{*}}$-${\mathit{m}}_{\mathrm{\ensuremath{\rho}}}$)${\mathit{m}}_{\mathrm{\ensuremath{\rho}}}$=2.25(3) agree somewhat better.