Measurement of the [ital CP]-violation parameter [eta][sub +[minus][gamma]] in neutral kaon decays
- Fermi National Accelerator Laboratory, Batavia, Illinois 60510 (United States)
- The Enrico Fermi Institute and the Department of Physics, The University of Chicago, Chicago, Illinois 60637 (United States)
- Department of Physics, Elmhurst College, Elmhurst, Illinois 60126 (United States) The Enrico Fermi Institute, The University of Chicago, Chicago, Illinois 60637 (United States)
- Department of Physics, Princeton University, Princeton, New Jersey 08544 (United States)
- Department de Physique des Particules Elementaires, Centre d'Etudes Nucleaires de Saclay, F-91191 Gif-sur-Yvette CEDEX (
Interference between [ital K][sub [ital S]] and [ital K][sub [ital L]] decays into the final state [pi][sup +][pi][sup [minus]][gamma] has been observed in experiment 731 at Fermilab. By fitting the distribution of decays downstream of a regenerator, a new CP-violation parameter [eta][sub +[minus][gamma]], analogous to [eta][sub +[minus]], has been measured, with its magnitude equal to (2.15[plus minus]0.26[plus minus]0.20)[times]10[sup [minus]3], and [phi][sub +[minus][gamma]], the associated phase angle, equal to (72[plus minus]23[plus minus]17)[degree]. Assuming that any difference between this fit value for [eta][sub +[minus][gamma]] and the previously measured value for [eta][sub +[minus]] can be attributed to direct CP violation in this decay, a limit of [vert bar][ital e][sub +[minus][gamma]][sup [prime]][vert bar]/[epsilon][lt]0.3 at the 90% confidence level has been made.
- OSTI ID:
- 6582915
- Journal Information:
- Physical Review Letters; (United States), Vol. 70:17; ISSN 0031-9007
- Country of Publication:
- United States
- Language:
- English
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