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First evidence for the decay {ital K{sub L}}{r_arrow}{ital e}{sup {bold +}}{ital e}{sup {bold {minus}}}{bold {mu}}{sup {bold +{mu}}}{sup {bold {minus}}}

Journal Article · · Physical Review Letters
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  1. Rutgers University, Piscataway, New Jersey 08855 (United States)
  2. University of California at Los Angeles, Los Angeles, California 90024 (United States)
  3. The Enrico Fermi Institute, The University of Chicago, Chicago, Illinois 60637 (United States)
  4. University of Colorado, Boulder, Colorado 80309 (United States)
  5. Elmhurst College, Elmhurst, Illinois 60126 (United States)
  6. Fermi National Accelerator Laboratory, Batavia, Illinois 60510 (United States)
  7. University of Illinois, Urbana, Illinois 61801 (United States)
  8. Department of Physics, Osaka University, Toyonaka, Osaka, 560 (Japan)
+ Show Author Affiliations

We present the first evidence for the decay {ital K}{sub {ital L}}{r_arrow}{ital e}{sup +}{ital e}{sup {minus}}{mu}{sup +}{mu}{sup {minus}} based on the observation of one event with an estimated background of 0.067{sub {minus}0.025}{sup +0.057} event. We determine the branching ratio to be {ital B}({ital K}{sub {ital L}}{r_arrow}{ital e}{sup +}{ital e}{sup {minus}}{mu}{sup +}{mu}{sup {minus}})=(2.9{sub {minus}2.4}{sup +6.7}){times}10{sup {minus}9}. In addition, we set a 90{percent} confidence upper limit on the combined branching ratio for the lepton flavor violating decays {ital K}{sub {ital L}}{r_arrow}{ital e}{sup {minus_plus}}{ital e}{sup {minus_plus}}{mu}{sup {plus_minus}}{mu}{sup {plus_minus}} to be {ital B}({ital K}{sub {ital L}}{r_arrow}{ital e}{sup {minus_plus}}{ital e}{sup {minus_plus}}{mu}{sup {plus_minus}}{mu}{sup {plus_minus}}){lt}6.1{times}10{sup {minus}9} assuming a uniform phase space distribution. {copyright} {ital 1996 The American Physical Society.}

OSTI ID:
285986
Journal Information:
Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 23 Vol. 76; ISSN 0031-9007; ISSN PRLTAO
Country of Publication:
United States
Language:
English

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Related Subjects

66 PHYSICS
BRANCHING RATIO
DISTRIBUTION
ELECTRONS
FLAVOR
KAONS NEUTRAL LONG-LIVED
LEPTONIC DECAY
MUONS MINUS
MUONS PLUS
PHASE SPACE
POSITRONS
VIOLATIONS