@article{9e2692c8d6794314ad7a35d8749164f4,
title = "Observation of cp violation in KL → π+π−e+e− decays",
abstract = "We report the first observation of a manifestly CP violating effect in the KL → π+π−e+e− decay mode. A large asymmetry was observed in the distribution of these decays in the CP-odd and T-odd angle φ between the decay planes of the e+e− and π+π− pairs in the KL center of mass system. After acceptance corrections, the overall asymmetry is found to be [13.6 ± 2.5(stat) ± 1.2(syst)]%. This is the largest CP-violating effect yet observed when integrating over the entire phase space of a mode and the first such effect observed in an angular variable.",
author = "{KTeV Collaboration} and A. Alavi-Harati and Albuquerque, {I. F.} and T. Alexopoulos and M. Arenton and K. Arisaka and S. Averitte and Barker, {A. R.} and L. Bellantoni and A. Bellavance and J. Belz and R. Ben-David and Bergman, {D. R.} and E. Blucher and Bock, {G. J.} and C. Bown and S. Bright and E. Cheu and S. Childress and R. Coleman and Corcoran, {M. D.} and G. Corti and B. Cox and Crisler, {M. B.} and Erwin, {A. R.} and R. Ford and A. Glazov and A. Golossanov and G. Graham and J. Graham and K. Hagan and E. Halkiadakis and K. Hanagaki and M. Hazumi and S. Hidaka and Hsiung, {Y. B.} and V. Jejer and J. Jennings and Jensen, {D. A.} and R. Kessler and Kobrak, {H. G.E.} and J. LaDue and A. Lath and A. Ledovskoy and McBride, {P. L.} and McManus, {A. P.} and P. Mikelsons and E. Monnier and T. Nakaya and U. Nauenberg and Nelson, {K. S.}",
year = "2000",
doi = "10.1103/PhysRevLett.84.408",
language = "English (US)",
volume = "84",
pages = "408--411",
journal = "Physical review letters",
issn = "0031-9007",
publisher = "American Physical Society",
number = "3",
}