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Radiative decays of K/sub L//sup 0/ mesons. [Branching ratio, improve upper limits, cp-conserving M1 transition]

Conference ·
OSTI ID:7155596
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In an experiment at the Brookhaven National Laboratory AGS a number of radiative decays of the K/sup 0//sub L/(..pi../sup +/..pi../sup -/..gamma.., e/sup +/e/sup -/..gamma.. and ..mu../sup +/..mu../sup -/..gamma..) were studied. The charged particles from these decays were detected in a 5000 wire proportional chamber spectrometer and the gammas were detected in a 194 element lead glass Cherenkov counter array. Preliminary results, based on approximately 25 percent of our total data sample, are as follows: The branching ratio K/sup 0//sub L/ yields ..pi pi gamma..(direct)/K/sup 0//sub L/ yields all = 5.5 /sup +/- 1.0 x 10/sup -5/. One example of the previously unobserved decay K/sup 0//sub L/ yields ee..gamma.. was found, yielding a branching ratio of 8.3 +- 8.3 x 10/sup -6/. No examples of the decays K/sup 0//sub L/ yields ..mu mu gamma.., ee..pi../sup 0/, and Z/sup +/..mu mu pi../sup 0/ were found, yielding improved upper limits of K/sup 0//sub L/ yields ..mu mu gamma../K/sup 0//sub L/ yields all < 1.3 x 10/sup -6/, K/sup 0//sub L/ yields ee..pi../sup 0//K/sup 0/sub L/ yields all < 1.4 x 10/sup -5/, K/sup 0//sub L/ yields ..mu mu pi../sup 0//K/sup 0//sub L/ yields all < 2.5 x 10/sup -6/ with 90 percent confidence.
Research Organization:
Brookhaven National Lab., Upton, N.Y. (USA); Rochester Univ., N.Y. (USA)
OSTI ID:
7155596
Report Number(s):
BNL-21620; CONF-760719-7
Country of Publication:
United States
Language:
English

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Related Subjects

645102* -- High Energy Physics-- Particle Interactions &amp; Properties-Experimental-- Weak Interactions &amp; Properties
645302 -- High Energy Physics-- Particle Invariance Principles &amp; Symmetries-- Applications to Electromagnetic &amp; Weak Interactions-- (-1987)
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ANTILEPTONS
ANTIMATTER
ANTIPARTICLES
BASIC INTERACTIONS
BOSONS
BOUNDARY CONDITIONS
BRANCHING RATIO
CP INVARIANCE
DECAY
ELECTRONS
ELEMENTARY PARTICLES
EMISSION
FERMIONS
HADRONS
INTERACTIONS
INVARIANCE PRINCIPLES
KAONS
KAONS NEUTRAL
KAONS NEUTRAL LONG-LIVED
LEPTONIC DECAY
LEPTONS
MASSLESS PARTICLES
MATRIX ELEMENTS
MESONS
MUONS
MUONS MINUS
MUONS PLUS
PARTICLE DECAY
PHOTONS
PIONS
PIONS MINUS
PIONS PLUS
POSITRONS
PSEUDOSCALAR MESONS
STRANGE PARTICLES
WEAK INTERACTIONS
WEAK PARTICLE DECAY