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ρ meson decay in 2 + 1 flavor lattice QCD.

Source :
Physical Review D: Particles, Fields, Gravitation & Cosmology. Nov2011, Vol. 84 Issue 9, p094505-1-094505-12. 12p.
Publication Year :
2011

Abstract

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 nonperturbatively 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 MeV (mπ/mρ = 0.46) and mπ = 300 MeV (mπ/mρ = 0.35), on a 32³ x 64 (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 Nf = 2 full QCD configurations and the experiment. [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
24700010
Volume :
84
Issue :
9
Database :
Academic Search Index
Journal :
Physical Review D: Particles, Fields, Gravitation & Cosmology
Publication Type :
Periodical
Accession number :
70489688
Full Text :
https://doi.org/10.1103/PhysRevD.84.094505