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Search for K sub L sup 0 r arrow. mu. e and K sub L sup 0 r arrow ee decays

Journal Article · · Physical Review (Section) D: Particles and Fields; (USA)
; ; ; ; ; ;  [1]; ; ; ;
  1. National Laboratory for High Energy Physics (KEK), Tsukuba, Ibaraki 305, Japan (JP)
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We report on the present status of a search for the rare decays {ital K}{sub {ital L}}{sup 0}{r arrow}{mu}e and {ital K}{sub {ital L}}{sup 0}{r arrow}ee at the KEK 12-GeV Proton Synchrotron. We found no {ital K}{sub {ital L}}{sup 0}{r arrow}{mu}e or {ital K}{sub {ital L}}{sup 0}{r arrow}ee events and found 54 {ital K}{sub {ital L}}{sup 0}{r arrow}{mu}{mu} events. The upper limits of the {ital K}{sub {ital L}}{sup 0}{r arrow}{mu}e and {ital K}{sub {ital L}}{sup 0}{r arrow}ee branching ratios are {ital B}({ital K}{sub {ital L}}{sup 0}{r arrow}{mu}e){lt}4.3{times}10{sup {minus}10} and {ital B}({ital K}{sub {ital L}}{sup 0}{r arrow}ee){lt}5.6{times}10{sup {minus}10} at 90% confidence level. The 54 {ital K}{sub {ital L}}{sup 0}{r arrow}{mu}{mu} events correspond to an absolute branching ratio of (8.4{plus minus}1.1){times}10{sup {minus}9}.

OSTI ID:
5593396
Journal Information:
Physical Review (Section) D: Particles and Fields; (USA), Journal Name: Physical Review (Section) D: Particles and Fields; (USA) Vol. 40:5; ISSN PRVDA; ISSN 0556-2821
Country of Publication:
United States
Language:
English

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Search for the rare decays K sub L sup 0 r arrow. mu. e and K sub L sup 0 r arrow ee
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Related Subjects

645102* -- High Energy Physics-- Particle Interactions & Properties-Experimental-- Weak Interactions & Properties
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ACCELERATORS
BASIC INTERACTIONS
BOSONS
BRANCHING RATIO
CYCLIC ACCELERATORS
DECAY
ELECTRONS
ELEMENTARY PARTICLES
FERMIONS
HADRONS
INTERACTIONS
KAONS
KAONS NEUTRAL
KAONS NEUTRAL LONG-LIVED
KEK SYNCHROTRON
LEPTONIC DECAY
LEPTONS
MESONS
MUONS
PARTICLE DECAY
PSEUDOSCALAR MESONS
STRANGE MESONS
STRANGE PARTICLES
SYNCHROTRONS
WEAK INTERACTIONS
WEAK PARTICLE DECAY