Phys. Rev. Lett.
84,
408–411
(2000)
Observation of CP Violation in KL→π+π-e+e- Decays
A. Alavi-Harati et al. (KTeV Collaboration)
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A. Alavi-Harati12, I. F. Albuquerque10, T. Alexopoulos12, M. Arenton11, K. Arisaka2, S. Averitte10, A. R. Barker5, L. Bellantoni7, A. Bellavance9, J. Belz10, R. Ben-David7, D. R. Bergman10, E. Blucher4, G. J. Bock7, C. Bown4, S. Bright4, E. Cheu1, S. Childress7, R. Coleman7, M. D. Corcoran9, G. Corti11, B. Cox11,*, M. B. Crisler7, A. R. Erwin12, R. Ford7, A. Glazov4, A. Golossanov11, G. Graham4, J. Graham4, K. Hagan11, E. Halkiadakis10, K. Hanagaki8, M. Hazumi8, S. Hidaka8, Y. B. Hsiung7, V. Jejer11, J. Jennings2, D. A. Jensen7, R. Kessler4, H. G. E. Kobrak3, J. LaDue5, A. Lath10, A. Ledovskoy11, P. L. McBride7, A. P. McManus11, P. Mikelsons5, E. Monnier4,†, T. Nakaya7, U. Nauenberg5, K. S. Nelson11, H. Nguyen7, V. O'Dell7, M. Pang7, R. Pordes7, V. Prasad4, C. Qiao4, B. Quinn4, E. J. Ramberg7, R. E. Ray7, A. Roodman4, M. Sadamoto8, S. Schnetzer10, K. Senyo8, P. Shanahan7, P. S. Shawhan4, J. Shields11, W. Slater2, N. Solomey4, S. V. Somalwar10, R. L. Stone10, I. Suzuki8, E. C. Swallow4,6, R. A. Swanson3, S. A. Taegar1, R. J. Tesarek10, G. B. Thomson10, P. A. Toale5, A. Tripathi2, R. Tschirhart7, Y. W. Wah4, J. Wang1, H. B. White7, J. Whitmore7, B. Winstein4, R. Winston4, J.-Y. Wu5, T. Yamanaka8, and E. D. Zimmerman4 (KTeV Collaboration)
1University of Arizona, Tucson, Arizona 85721
2University of California at Los Angeles, Los Angeles, California 90095
3University of California at San Diego, La Jolla, California 92093
4The Enrico Fermi Institute, The University of Chicago, Chicago, Illinois 60637
5University of Colorado, Boulder, Colorado 80309
6Elmhurst College, Elmhurst, Illinois 60126
7Fermi National Accelerator Laboratory, Batavia, Illinois 60510
8Osaka University, Toyonaka, Osaka 560 Japan
9Rice University, Houston, Texas 77005
10Rutgers University, Piscataway, New Jersey 08855
11The Department of Physics and Institute of Nuclear and Particle Physics, University of Virginia, Charlottesville, Virginia 22901
12University of Wisconsin, Madison, Wisconsin 53706
Received 2 August 1999; published in the issue dated 17 January 2000
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.
© 2000 The American Physical Society
URL:
http://link.aps.org/doi/10.1103/PhysRevLett.84.408
DOI:
10.1103/PhysRevLett.84.408
*To whom correspondence should be addressed. Electronic address: cox@uvahep.phys.virginia.edu †On leave from C.P.P. Marseille/C.N.R.S., France.
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