{rho} meson decay in 2+1 flavor lattice QCD

Journal Article · Tue Nov 01 00:00:00 EDT 2011 · Physical Review. D, Particles Fields

DOI:https://doi.org/10.1103/PHYSREVD.84.094505· OSTI ID:21611519

Aoki, S; Ishizuka, N; Taniguchi, Y; Ukawa, A; Yoshie, T ^[1]; Ishikawa, K-I; Okawa, M ^[2]; Kanaya, K ^[1]; Kuramashi, Y ^[1]; Namekawa, Y; Ukita, N ^[3]; Yamazaki, T ^[4]

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1. Graduate School of Pure and Applied Sciences, University of Tsukuba, Tsukuba, Ibaraki 305-8571 (Japan)
2. Department of Physics, Hiroshima University, Higashi-Hiroshima, Hiroshima 739-8526 (Japan)
3. Center for Computational Sciences, University of Tsukuba, Tsukuba, Ibaraki 305-8577 (Japan)
4. Kobayashi-Maskawa Institute for the Origin of Particles and the Universe, Nagoya University, Nagoya, Aichi 464-8602 (Japan)

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.

• OSTI ID: 21611519
• Journal Information: Physical Review. D, Particles Fields, Vol. 84, Issue 9; Other Information: DOI: 10.1103/PhysRevD.84.094505; (c) 2011 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
COMPARATIVE EVALUATIONS
CONFIGURATION
COUPLING CONSTANTS
FLAVOR MODEL
ISOSPIN
LATTICE FIELD THEORY
MASS
MEV RANGE 100-1000
P WAVES
PARTICLE DECAY
PERTURBATION THEORY
PHASE SHIFT
PIONS
QUANTUM CHROMODYNAMICS
QUARKS
RENORMALIZATION
RESONANCE
SCATTERING
VECTOR MESONS
BOSONS
COMPOSITE MODELS
CONSTRUCTIVE FIELD THEORY
DECAY
ELEMENTARY PARTICLES
ENERGY RANGE
EVALUATION
FERMIONS
FIELD THEORIES
HADRONS
MATHEMATICAL MODELS
MESONS
MEV RANGE
PARTIAL WAVES
PARTICLE MODELS
PARTICLE PROPERTIES
PSEUDOSCALAR MESONS
QUANTUM FIELD THEORY
QUARK MODEL