2011/06/30 by CS collaboration, S. Aoki, K. I. Ishikawa +10 · 1 citation
Physics and Astronomy · #hep-lat
paper · pdf · doi:10.1103/physrevd.84.094505
published as Phys.Rev.D84(2011)094505 · LaTeX2e, 24 pages, 9 eps figures, uses revtex4 and graphicx, published in PRD
arxiv created 2011/11/24 · arxiv updated 2012/08/27
We perform a lattice QCD study of the ρ 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 ρ→ππ 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, mπ=410 \rm MeV (mπ/mρ=0.46) and mπ=300 \rm MeV (mπ/mρ=0.35), on a 323× 64 (La=2.9 \rm fm) lattice at the lattice spacing a=0.091 \rm fm. 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.