Pion-pair contribution to the decay K sub L r arrow. pi. sup 0. gamma. gamma

Journal Article · Fri Dec 01 04:00:00 EST 1989 · Physical Review (Section) D: Particles and Fields; (USA)

DOI:https://doi.org/10.1103/PhysRevD.40.3775· OSTI ID:7273840

Ko, P ^[1]; Rosner, J L ^[2]

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1. Enrico Fermi Institute Department of Physics, University of Chicago, Chicago, Illinois 60637 (USA)
2. Institute for Advanced Study, Princeton, New Jersey 08540 (USA)

A simple prediction for the decay {ital K}{sub {ital L}}{r arrow}{pi}{sup 0}{gamma}{gamma}, obtained from the rescattering to two photons of the {pi}{sup +}{pi}{sup {minus}} intermediate state in the process {ital K}{sub {ital L}}{r arrow}{pi}{sup +}{pi}{sup {minus}}{pi}{sup 0}, is compared with a recent calculation based on chiral perturbation theory. The {pi}{sup +}{pi}{sup {minus}} rescattering model predicts a two-photon effective mass spectrum peaked at slightly higher {ital m}{sub {gamma}{gamma}} than in chiral perturbation theory, and a branching ratio {ital B}({ital K}{sub {ital L}}{r arrow}{pi}{sup 0}{gamma}{gamma}){approx}7.5{times}10{sup {minus}7}. Implications are discussed for the corresponding decay of the charged kaon.

• OSTI ID: 7273840
• Journal Information: Physical Review (Section) D: Particles and Fields; (USA), Journal Name: Physical Review (Section) D: Particles and Fields; (USA) Vol. 40:11; 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
BOSONS
BRANCHING RATIO
CHIRAL SYMMETRY
CP INVARIANCE
DALITZ PLOT
DIAGRAMS
ELEMENTARY PARTICLES
HADRONS
INVARIANCE PRINCIPLES
ISOSPIN
KAONS
KAONS NEUTRAL
KAONS NEUTRAL LONG-LIVED
MASS SPECTRA
MATRIX ELEMENTS
MESONS
PARTIAL WAVES
PARTICLE PROPERTIES
PERTURBATION THEORY
PIONS
PIONS MINUS
PIONS NEUTRAL
PIONS PLUS
PSEUDOSCALAR MESONS
RADIATIVE DECAY
RESCATTERING
S WAVES
SCATTERING
SCATTERPLOTS
SPECTRA
STRANGE MESONS
STRANGE PARTICLES
SYMMETRY