Light hadron spectrum in quenched lattice QCD with staggered quarks

Without chiral extrapolation, we achieved a realistic nucleon to (\rho)-meson mass ratio of (m_N/m_\rho = 1.23 \pm 0.04 ({\rm statistical}) \pm 0.02 ({\rm systematic})) in our quenched lattice QCD numerical calculation with staggered quarks. The systematic error is mostly from finite-volume effect and the finite-spacing effect is negligible. The flavor symmetry breaking in the pion and (\rho) meson is no longer visible. The lattice cutoff is set at 3.63 (\pm) 0.06 GeV, the spatial lattice volume is (2.59 (\pm) 0.05 fm)(^3), and bare quarks mass as low as 4.5 MeV are used. Possible quenched chiral effects in hadron mass are discussed.

fermion: lattice field theory
gauge field theory: SU(3)
approximation: quenching
mass ratio: (nucleon rho(770))
effect: finite size
symmetry breaking: flavor
quark: mass
hadron: mass spectrum
symmetry: chiral
numerical calculations: Monte Carlo

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