出版社：SISSA, Scuola Internazionale Superiore di Studi Avanzati
摘要：We perform a lattice QCD study of the r meson decay from the Nf = 2+1 full QCD configurations generated with a renormalization group improved gauge action and a non-perturbatively O(a)-improved Wilson fermion action. The resonance parameters, the effective r →pp coupling constant and the resonance mass, are estimated from the P-wave scattering phase shift for the isospin I = 1 two-pion system. The finite size formulas are employed to calculate the phase shift from the energy on the lattice. Our calculations are carried out at two quark masses, mp =410MeV (mp /mr =0.46) and mp =300MeV (mp /mr =0.35), on a 323×64 (La=2.9fm) lattice at the lattice spacing a = 0.091fm. We compare our results at these two quark masses with those given in the previous works using Nf = 2 full QCD configurations and the experiment.
