Measurement of the branching ratio of the decay K sub L r arrow. pi. sup 0. gamma. gamma

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

DOI:https://doi.org/10.1103/PhysRevD.44.R573· OSTI ID:5375303

Papadimitriou, V; Barker, A; Briere, R A; Gibbons, L K; Makoff, G; Patterson, J R; Somalwar, S; Wah, Y W; Winstein, B; Winston, R; Woods, M; Yamamoto, H ^[1]; Swallow, E C ^[2]; Bock, G J; Coleman, R; Enagonio, J; Hsiung, Y B; Ramberg, E; Stanfield, K; Tschirhart, R ; Yamanaka, T ^[3]; Gollin, G D; Karlsson, M; Okamitsu, J K ^[4]; Debu, P; Peyaud, B; Turlay, R; Vallage, B ^[5]

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1. The Enrico Fermi Institute and the Department of Physics, The University of Chicago, Chicago, IL (USA)
2. Department of Physics, Elmhurst College, Elmhurst, IL (USA) Enrico Fermi Institute, The University of Chicago, Chicago, IL (USA)
3. Fermi National Accelerator Laboratory, Batavia, IL (USA)
4. Department of Physics, Princeton University, Princeton, NJ (USA)
5. Department de Physique des Particules Elementaires, Centre d'Etudes Nucleaires de Saclay, F-91191 Gif-sur-Yvette CEDEX, France (FR)

Using the complete Fermilab E371 data set, we find {Gamma}({ital K}{sub {ital L}}{r arrow}{pi}{sup 0}{gamma}{gamma},+{ital m}{sub {gamma}{gamma}}{ge}0.280 GeV)/{Gamma}({ital K}{sub {ital L}}{r arrow}all) =(1.86{plus minus}0.60{plus minus}0.60){times}10{sup {minus}6}, in good agreement with a recent report of the first observation of this decay. For the low {gamma}{gamma} mass region we find {Gamma}({ital K}{sub {ital L}}{r arrow}{pi}{sup 0}{gamma}{gamma},{ital m}{sub {gamma}{gamma}}{lt}0.264 GeV)/{Gamma}({ital K}{sub {ital L}}{r arrow}all){lt} 5.1{times}10{sup {minus}6} (90% confidence).

• OSTI ID: 5375303
• Journal Information: Physical Review, D (Particles Fields); (United States), Journal Name: Physical Review, D (Particles Fields); (United States) Vol. 44:3; ISSN PRVDA; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

645101* -- High Energy Physics-- Particle Interactions & Properties-Experimental-- Electromagnetic Interactions & Properties
645300 -- High Energy Physics-- Particle Invariance Principles & Symmetries
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
BOSONS
BRANCHING RATIO
CP INVARIANCE
DECAY
ELECTROMAGNETIC RADIATION
ELEMENTARY PARTICLES
GAMMA RADIATION
HADRONS
INVARIANCE PRINCIPLES
IONIZING RADIATIONS
KAONS
KAONS NEUTRAL
KAONS NEUTRAL LONG-LIVED
MASS SPECTRA
MASSLESS PARTICLES
MATHEMATICAL MODELS
MATHEMATICAL SPACE
MESONS
MONTE CARLO METHOD
PARTICLE DECAY
PARTICLE MODELS
PARTICLE PRODUCTION
PERTURBATION THEORY
PHASE SPACE
PHOTONS
PIONS
PIONS NEUTRAL
PSEUDOSCALAR MESONS
RADIATIONS
RADIATIVE DECAY
SPACE
SPECTRA
STRANGE MESONS
STRANGE PARTICLES
VECTOR DOMINANCE MODEL
VECTOR MESONS