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Measurement of the Branching Ratio and Form Factor of {ital K}{sub {ital L}}{r_arrow}{mu}{sup +}{mu}{sup {minus}}{gamma}

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

We report on a measurement of the decay {ital K}{sub {ital L}}{r_arrow}{mu}{sup +}{mu}{sup {minus}}{gamma} from Fermilab experiment E799. We observe 207 candidate signal events with an estimated background of 10.5{plus_minus}4.0 events and establish {ital B}({ital K}{sub {ital L}}{r_arrow}{mu}{sup +}{mu}{sup {minus}}{gamma})=[3.23{plus_minus}0.23(stat){plus_minus}0.19(syst)]{times}10{sup {minus}7}. This provides the first measurement of the {ital K}{gamma}{gamma}{sup *} form factor in the muonic Dalitz decay mode of the {ital K}{sub {ital L}}.

OSTI ID:
46398
Journal Information:
Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 17 Vol. 74; ISSN 0031-9007; ISSN PRLTAO
Country of Publication:
United States
Language:
English

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Related Subjects

66 PHYSICS
BRANCHING RATIO
FORM FACTORS
GAMMA DECAY
KAONS NEUTRAL LONG-LIVED
MASS DISTRIBUTION
MUONS MINUS
MUONS PLUS
QUANTUM ELECTRODYNAMICS
VECTOR DOMINANCE MODEL