Measurement of the Branching Fraction of the Decay {ital K}{sub {ital {ital L}}}{r_arrow}{pi}{sup +}{pi}{sup {minus}}{ital e}{sup {ital +}}{ital e}{sup {ital {minus}}}
Journal Article
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· Physical Review Letters
OSTI ID:627922
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- University of Arizona, Tucson, Arizona 85721 (United States)
- University of California at Los Angeles, Los Angeles, California 90095 (United States)
- University of California at San Diego, La Jolla, California 92093 (United States)
- The Enrico Fermi Institute, The University of Chicago, Chicago, Illinois 60637 (United States)
- University of Colorado, Boulder, Colorado 80309 (United States)
- Elmhurst College, Elmhurst, Illinois 60126 (United States)
- Fermi National Accelerator Laboratory, Batavia, Illinois 60510 (United States)
- Osaka University, Toyonaka, Osaka 560 (Japan)
- Rice University, Houston, Texas 77005 (United States)
- Rutgers University, Piscataway, New Jersey 08855 (United States)
- The Department of Physics and Institute of Nuclear and Particle Physics, University of Virginia, Charlottesville, Virginia 22901 (United States)
We report the first branching fraction measurement of the decay K{sub L}{r_arrow}{pi}{sup +}{pi}{sup {minus}}e{sup +}e{sup {minus}} . With a sample of 46 candidates, and an expected background level of 9.4 events, the branching fraction is determined to be B(K{sub L}{r_arrow}{pi}{sup +}{pi}{sup {minus} }e{sup +}e{sup {minus}})=[3.2{plus_minus}0.6 (stat){plus_minus}0.4(syst) ]{times}10{sup {minus}7} . This measurement was carried out as part of the Fermilab KTeV (E799-II) experiment and is in good agreement with the expectations from the mechanisms of direct emission and inner bremsstrahlung. {copyright} {ital 1998} {ital The American Physical Society}
- OSTI ID:
- 627922
- Journal Information:
- Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 19 Vol. 80; ISSN 0031-9007; ISSN PRLTAO
- Country of Publication:
- United States
- Language:
- English
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