Observation of CP violation in K-L ->pi(+)pi(-)e(+)e(-) decays

Citation
A. Alavi-harati et al., Observation of CP violation in K-L ->pi(+)pi(-)e(+)e(-) decays, PHYS REV L, 84(3), 2000, pp. 408-411
Citations number
10
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Physics
Journal title
PHYSICAL REVIEW LETTERS
ISSN journal
0031-9007 → ACNP
Volume
84
Issue
3
Year of publication
2000
Pages
408 - 411
Database
ISI
SICI code
0031-9007(20000117)84:3<408:OOCVIK>2.0.ZU;2-9
Abstract
We report the first observation of a manifestly CP violating effect in the K-L --> pi(+) pi(-) e(+) e(-) decay mode. A large asymmetry was observed in the distribution of these decays in the CP-odd and T-odd angle phi between the decay planes of the e(+) e(-) and pi(+) pi(-) pairs in the K-L center of mass system. After acceptance corrections, the overall asymmetry is foun d to be [13.6 +/- 2.5(stat) +/- 1.2(syst)]%. This is the largest CP-violati ng effect yet observed when integrating over the entire phase space of a mo de and the first such effect observed in an angular variable.