gamma. gamma. r arrow. pi. sup 0. pi. sup 0 and K sub L r arrow. pi. sup 0. gamma. gamma. in the chiral quark model

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

DOI:https://doi.org/10.1103/PhysRevD.44.3555· OSTI ID:6091368

Bijnens, J ^[1]; Dawson, S ^[2]; Valencia, G ^[3]

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1. Theory Division, CERN, CH-1211, Geneva 23 (Switzerland)
2. Physics Department, Brookhaven National Laboratory, Upton, New York 11973 (United States)
3. Theory Division, CERN, CH-1211, Geneva, 23 (Switzerland)

We consider the process {gamma}{gamma}{r arrow}{pi}{sup 0}{pi}{sup 0} within the quark model. We find small corrections to the lowest-order result obtained from chiral loops. These corrections are very similar to those found in vector-meson-dominated models, and too small to be tested with the present data. We use this result, together with a simple pole model, to find the amplitude for {ital K}{sub {ital L}}{r arrow}{pi}{sup 0}{gamma}{gamma} and use this to estimate the {ital CP}-conserving part of {ital K}{sub {ital L}}{r arrow}{pi}{sup 0}{ital e+}{ital e{minus}}. For this last process we find a branching ratio {similar to}2.3{times}10{sup {minus}13}, significantly smaller than the {ital CP}-violating contribution.

• DOE Contract Number: AC02-76CH00016
• OSTI ID: 6091368
• Journal Information: Physical Review, D (Particles Fields); (United States), Journal Name: Physical Review, D (Particles Fields); (United States) Vol. 44:11; ISSN PRVDA; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

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72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
BASIC INTERACTIONS
BOSONS
BRANCHING RATIO
CHIRAL SYMMETRY
COMPOSITE MODELS
CP INVARIANCE
DECAY
ELECTROMAGNETIC INTERACTIONS
ELEMENTARY PARTICLES
FIELD THEORIES
HADRONS
INTERACTIONS
INVARIANCE PRINCIPLES
KAONS
LIE GROUPS
MASSLESS PARTICLES
MATHEMATICAL MODELS
MESONS
PAIR PRODUCTION
PARTICLE INTERACTIONS
PARTICLE MODELS
PARTICLE PRODUCTION
PHOTON-PHOTON INTERACTIONS
PHOTONS
PIONS
PIONS NEUTRAL
PSEUDOSCALAR MESONS
QUANTUM CHROMODYNAMICS
QUANTUM FIELD THEORY
QUARK MODEL
STRANGE MESONS
STRANGE PARTICLES
SU GROUPS
SU-3 GROUPS
SYMMETRY
SYMMETRY BREAKING
SYMMETRY GROUPS
VECTOR DOMINANCE MODEL