V sup 0 r arrow. pi. sup +. pi. sup minus. gamma. decay rates

Journal Article · Sun Sep 01 04:00:00 EDT 1991 · Physical Review, D (Particles Fields); (United States)

DOI:https://doi.org/10.1103/PhysRevD.44.1599· OSTI ID:5219865

Fajfer, S ^[1]; Oakes, R J ^[2]

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1. Institute of Physics, University of Sarajevo, Sarajevo (Yugoslavia)
2. Department of Physics and Astronomy, Northwestern University, Evanston, Illinois (USA)

In the radiative decays of the neutral vector mesons into charged pions there are contributions from both bremsstrahlung and diagrams with internal vector mesons. We have calculated both these contributions for the processes {rho}{r arrow}{pi}{sup +}{pi}{sup {minus}}{gamma}, {omega}{r arrow}{pi}{sup +}{pi}{sup {minus}}{gamma}, and {phi}{r arrow}{pi}{sup +}{pi}{sup {minus}}{gamma}. As expected, bremsstrahlung dominates {rho}{r arrow}{pi}{sup +}{pi}{sup {minus}}{gamma}, in agreement with the data. However, for {omega}{r arrow}{pi}{sup +}{pi}{sup {minus}}{gamma} the vector-meson pole diagrams arising from gauging the anomalous Wess-Zumino terms are comparable to the bremsstrahlung contributions and for {phi}{r arrow}{pi}{sup +}{pi}{sup {minus}}{gamma} they even dominate the bremsstrahlung contributions. In these decays, both contributions are {ital O}({alpha}{sup 3}) since the nonradiative process is isospin nonconserving. However, {omega}-{rho} mixing is quite important while {phi}-{rho} mixing is a smaller effect. Numerical results are given for the decay width of these processes for various values of the cutoff on the minimum photon energy measured.

• OSTI ID: 5219865
• Journal Information: Physical Review, D (Particles Fields); (United States), Journal Name: Physical Review, D (Particles Fields); (United States) Vol. 44:5; ISSN PRVDA; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

645202* -- High Energy Physics-- Particle Interactions & Properties-Theoretical-- Electromagnetic Interactions & Properties
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
BASIC INTERACTIONS
BOSONS
BRANCHING RATIO
BREMSSTRAHLUNG
DECAY
ELECTROMAGNETIC INTERACTIONS
ELECTROMAGNETIC RADIATION
ELEMENTARY PARTICLES
FERMIONS
FUNCTIONS
GAMMA RADIATION
HADRONS
INTERACTIONS
IONIZING RADIATIONS
ISOSPIN
LAGRANGIAN FUNCTION
MASS
MESONS
PARTICLE DECAY
PARTICLE PRODUCTION
PARTICLE PROPERTIES
PIONS
PIONS MINUS
PIONS PLUS
POSTULATED PARTICLES
PSEUDOSCALAR MESONS
QUARKS
RADIATIONS
RADIATIVE DECAY
VECTOR MESONS