Published November 1, 2007 | Version v1
Journal article Metadata-only

Lattice QCD calculation of the ρ meson decay width

Creators

  • 1. Riken BNL Research Center, Brookhaven National Laboratory, Upton, New York 11973 (United States)
  • 2. Graduate School of Pure and Applied Sciences, University of Tsukuba, Tsukuba, Ibaraki 305-8571 (Japan)
  • 3. Institute for Cosmic Ray Research, University of Tokyo, Kashiwa 277 8582 (Japan)
  • 4. Department of Physics, Hiroshima University, Higashi-Hiroshima, Hiroshima 739-8526 (Japan)
  • 5. Center for Computational Sciences, University of Tsukuba, Tsukuba, Ibaraki 305-8577 (Japan)
  • 6. Department of Physics, Nagoya University, Nagoya 464-8602 (Japan)

Description

We present a lattice QCD calculation of the ρ meson decay width via the P-wave scattering phase shift for the I=1 two-pion system. Our calculation uses full QCD gauge configurations for Nf=2 flavors generated using a renormalization group improved gauge action and an improved Wilson fermion action on a 123x24 lattice at mπ/mρ=0.41 and the lattice spacing 1/a=0.92 GeV. The phase shift calculated with the use of the finite size formula for the two-pion system in the moving frame shows a behavior consistent with the existence of a resonance at a mass close to the vector meson mass obtained in spectroscopy. The decay width estimated from the phase shift is consistent with the experiment, when the quark mass is scaled to the realistic value

Additional details

Identifiers

DOI
10.1103/PhysRevD.76.094506;
arXiv
arXiv:0708.3705v1;

Publishing Information

Journal Title
Physical Review. D, Particles Fields
Journal Volume
76
Journal Issue
9
Journal Page Range
p. 094506-094506.8
ISSN
0556-2821
CODEN
PRVDAQ

INIS

Country of Publication
United States
Country of Input or Organization
International Atomic Energy Agency (IAEA)
INIS RN
39052794
Subject category
S72: PHYSICS OF ELEMENTARY PARTICLES AND FIELDS;
Descriptors DEI
ACTION INTEGRAL; FLAVOR MODEL; GEV RANGE; LATTICE FIELD THEORY; P WAVES; PARTICLE DECAY; PARTICLE WIDTHS; PHASE SHIFT; PIONS; QUANTUM CHROMODYNAMICS; QUARKS; RENORMALIZATION; REST MASS; RHO-770 MESONS; WILSON LOOP
Descriptors DEC
BOSONS; COMPOSITE MODELS; CONSTRUCTIVE FIELD THEORY; DECAY; ELEMENTARY PARTICLES; ENERGY RANGE; FERMIONS; FIELD THEORIES; HADRONS; INTEGRALS; MASS; MATHEMATICAL MODELS; MESONS; PARTIAL WAVES; PARTICLE MODELS; PARTICLE PROPERTIES; PSEUDOSCALAR MESONS; QUANTUM FIELD THEORY; QUARK MODEL; VECTOR MESONS

Optional Information

Notes
(c) 2007 The American Physical Society
Collaborations
CP-PACS Collaboration