ρ meson decay in 2+1 flavor lattice QCD
ρ meson decay in 2+1 flavor lattice QCD
复制标题
DOI：
10.1103/physrevd.84.094505
复制
发表时间：
2011-11
影响因子：
5
通讯作者：
S. Aoki;K. Ishikawa;N. Ishizuka;K. Kanaya;Y. Kuramashi;Y. Namekawa;M. Okawa;Y. Taniguchi;A. Ukawa;N. Ukita;T. Yamazaki;T. Yoshie
中科院分区：
文献类型：
--
作者：
S. Aoki;K. Ishikawa;N. Ishizuka;K. Kanaya;Y. Kuramashi;Y. Namekawa;M. Okawa;Y. Taniguchi;A. Ukawa;N. Ukita;T. Yamazaki;T. Yoshie
We perform a lattice QCD study of the {rho} meson decay from the N{sub f}=2+1 full QCD configurations generated with a renormalization group improved gauge action and a nonperturbatively O(a)-improved Wilson fermion action. The resonance parameters, the effective {rho}{yields}{pi}{pi} 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, m{sub {pi}=}410 MeV (m{sub {pi}/}m{sub {rho}=}0.46) and m{sub {pi}=}300 MeV (m{sub {pi}/}m{sub {rho}=}0.35), on a 32{sup 3}x64 (La=2.9 fm) lattice at the lattice spacing a=0.091 fm. We compare our results at these two quark masses with those given in the previous works using N{sub f}=2 full QCD configurations and the experiment.
We perform a lattice QCD study of the {rho} meson decay from the N{sub f}=2+1 full QCD configurations generated with a renormalization group improved gauge action and a nonperturbatively O(a)-improved Wilson fermion action. The resonance parameters, the effective {rho}{yields}{pi}{pi} 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, m{sub {pi}=}410 MeV (m{sub {pi}/}m{sub {rho}=}0.46) and m{sub {pi}=}300 MeV (m{sub {pi}/}m{sub {rho}=}0.35), on a 32{sup 3}x64 (La=2.9 fm) lattice at the lattice spacing a=0.091 fm. We compare our results at these two quark masses with those given in the previous works using N{sub f}=2 full QCD configurations and the experiment.