New measurement of the {ital CP} violation parameter {eta}{sub +{minus}{gamma}}
Journal Article
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· Physical Review Letters
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- Rutgers University, Piscataway, New Jersey 08855 (United States)
- The Enrico Fermi Institute, The University of Chicago, Chicago, Illinois 60637 (United States)
- Elmhurst College, Elmhurst, Illinois 60126 (United States)
- Fermi National Accelerator Laboratory, Batavia, Illinois 60510 (United States)
- University of Illinois, Urbana, Illinois 61801 (United States)
We have measured the {ital CP} violation parameter {eta}{sub +{minus}{gamma}} in a neutral kaon experiment, E773, at Fermilab. This parameter characterizes {ital CP} violation in the decay {ital K}{sub {ital L}}{r_arrow}{pi}{sup +}{pi}{sup {minus}}{gamma}. Kaon decays into {pi}{sup +}{pi}{sup {minus}} collected simultaneously were used for normalization. Our result is {vert_bar}{eta}{sub +{minus}{gamma}}{vert_bar}=[2.359 {plus_minus} 0.062(stat) {plus_minus} 0.040(syst)] {times} 10{sup {minus}3} with a phase {phi}{sub +{minus}{gamma}} = [43.8 {plus_minus} 3.5(stat) {times} 1.9(syst){degree}]. The prediction that {eta}{sub +{minus}{gamma}} should be very close to {eta}{sub +{minus}} is supported by our result.
- OSTI ID:
- 122922
- Journal Information:
- Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 15 Vol. 75; ISSN 0031-9007; ISSN PRLTAO
- Country of Publication:
- United States
- Language:
- English
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