1111.0377Nov 2, 20117 pages, 8 figures, Talk presented at the XXIX International Symposium on Lattice Filed Theory - Lattice 2011, July 10-16, 2011, Squaw Valley, Lake Tahoe, California
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)
Nearby in the stack
-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=410MeV
(
mπ/mρ=0.46
) and
mπ=300MeV
(
mπ/mρ=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