Effective low-energy, large- N Lagrangian calculation of the K r arrow. pi. pi. pi. gamma. decay modes

• Published in: Physical review. D, Particles and fields Particles and fields, 1990-12, Vol.42:11
• Main Authors: Fajfer, S., Suruliz, K., Oakes, R.J.
• Format: Article
• Language: English
• Subjects: 645202 - High Energy Physics- Particle Interactions & Properties-Theoretical- Electromagnetic Interactions & Properties; BOSON EXPANSION; BOSONS; BRANCHING RATIO; BREMSSTRAHLUNG; COMPOSITE MODELS; ELECTROMAGNETIC RADIATION; ELEMENTARY PARTICLES; FLAVOR MODEL; FUNCTIONS; GAUGE INVARIANCE; HADRONS; INVARIANCE PRINCIPLES; KAONS; KAONS NEUTRAL; KAONS NEUTRAL LONG-LIVED; KAONS PLUS; LAGRANGIAN FUNCTION; LIE GROUPS; MATHEMATICAL MODELS; MESONS; PARTICLE MODELS; PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; PIONS; PSEUDOSCALAR MESONS; QUARK MODEL; RADIATIONS; RADIATIVE DECAY; STRANGE MESONS; STRANGE PARTICLES; SU GROUPS; SU-3 GROUPS; SYMMETRY GROUPS
• ISSN: 0556-2821; 1089-4918
• DOI: 10.1103/PhysRevD.42.3875

Branching ratios for the decays {ital K}{sup +}{r arrow}{pi}{sup +}{pi}{sup +}{pi}{sup {minus}}{gamma}, {ital K}{sup +}{r arrow}{pi}{sup +}{pi}{sup 0}{pi}{sup 0}{gamma}, and {ital K}{sub {ital L}}{sup 0}{r arrow}{pi}{sup +}{pi}{sup {minus}}{pi}{sup 0}{gamma} are calculated in the large-{ital N} limit using an effective low-energy Lagrangian which gives a good description of the nonradiative {ital K}{r arrow}{pi}{pi}{pi} decays. In addition to the bremsstrahlung contributions to the amplitude, the direct-emission terms are systematically included and found to be significant. The results are in reasonable agreement with the existing data.