Published August 1, 2007
| Version v1
Journal article
Role of resonances in ρ0→π+π-γ
- 1. Departamento de Fisica, Centro Universitario de Ciencias Exactas e Ingenierias, Universidad de Guadalajara, Boulevard Marcelino Garcia Barragan 1508, C. P. 44840, Guadalajara, Jalisco (Mexico)
- 2. Instituto de Fisica, Universidad Nacional Autonoma de Mexico, Mexico D. F. C. P. 04510 (Mexico)
Description
We study the effect of the σ(600) and a1(1260) resonances in the ρ0→π+π-γ decay within the meson dominance model. Major effects are driven by the mass and width parameters of the σ(600), and the usually neglected contribution of the a1(1260), although small by itself, may become sizable through its interference with pion bremsstrahlung, and the proper relative sign can favor the central value of the experimental branching ratio. We present a procedure, using the gauge invariant structure of the resonant amplitudes, to kinematically enhance the resonant effects in the angular and energy distribution of the photon. We also elaborate on the coupling constants involved
Additional details
Identifiers
- DOI
- 10.1103/PhysRevD.76.033001;
- arXiv
- arXiv:0706.2205v1;
Publishing Information
- Journal Title
- Physical Review. D, Particles Fields
- Journal Volume
- 76
- Journal Issue
- 3
- Journal Page Range
- p. 033001-033001.6
- ISSN
- 0556-2821
- CODEN
- PRVDAQ
INIS
- Country of Publication
- United States
- Country of Input or Organization
- International Atomic Energy Agency (IAEA)
- INIS RN
- 39049403
- Subject category
- S72: PHYSICS OF ELEMENTARY PARTICLES AND FIELDS;
- Descriptors DEI
- A1-1260 MESONS; BRANCHING RATIO; BREMSSTRAHLUNG; COUPLING CONSTANTS; ENERGY SPECTRA; GAUGE INVARIANCE; INTERFERENCE; PARTICLE WIDTHS; PHOTONS; PIONS MINUS; QUANTUM CHROMODYNAMICS; RADIATIVE DECAY; RESONANCE PARTICLES; REST MASS; RHO-770 MESONS; VECTOR DOMINANCE MODEL
- Descriptors DEC
- AXIAL VECTOR MESONS; BOSONS; DECAY; DIMENSIONLESS NUMBERS; ELECTROMAGNETIC RADIATION; ELEMENTARY PARTICLES; FIELD THEORIES; HADRONS; INVARIANCE PRINCIPLES; MASS; MASSLESS PARTICLES; MATHEMATICAL MODELS; MESONS; PARTICLE DECAY; PARTICLE MODELS; PARTICLE PROPERTIES; PIONS; PSEUDOSCALAR MESONS; QUANTUM FIELD THEORY; RADIATIONS; SPECTRA; VECTOR MESONS
Optional Information
- Notes
- (c) 2007 The American Physical Society