Phys. Rev. Lett.
89,
211801
(2002)
[4 pages]
Search for the KL→π0π0e+e- Decay in the KTeV Experiment
A. Alavi-Harati et al. KTeV Collaboration
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A. Alavi-Harati12, T. Alexopoulos12, M. Arenton11, K. Arisaka2, S. Averitte10, R. F. Barbosa7,*, A. R. Barker5, M. Barrio4, L. Bellantoni7, A. Bellavance9, J. Belz10, 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, A. R. Erwin12, R. Ford7, A. Glazov4, A. Golossanov11, G. Graham4, J. Graham4, E. Halkiadakis10, J. Hamm1, K. Hanagaki8, S. Hidaka8, Y. B. Hsiung7, V. Jejer11, D. A. Jensen7, R. Kessler4, H. G. E. Kobrak3, J. LaDue5, A. Lath10, A. Ledovskoy11,†, P. L. McBride7, P. Mikelsons5, E. Monnier4,‡, T. Nakaya7, K. S. Nelson11, H. Nguyen7, V. O’Dell7, R. Pordes7, V. Prasad4, X. R. Qi7, B. Quinn4, E. J. Ramberg7, R. E. Ray7, A. Roodman4, S. Schnetzer10, K. Senyo8, P. Shanahan7, P. S. Shawhan4, J. Shields11, W. Slater2, N. Solomey4, S. V. Somalwar10, R. L. Stone10, E. C. Swallow4,6, S. A. Taegar1, R. J. Tesarek10, G. B. Thomson10, P. A. Toale5, A. Tripathi2, R. Tschirhart7, S. E. Turner2, Y. W. Wah4, J. Wang1, H. B. White7, J. Whitmore7, B. Winstein4, R. Winston4, 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 11 December 2001; revised 12 July 2002; published 31 October 2002
The recent discovery of a large CP violating asymmetry in KL→π+π-e+e- mode has prompted us to seach for the associated KL→π0π0e+e- decay mode in the KTeV-E799 experiment at Fermilab. In 2.7×1011 KL decays, one candidate event has been observed with an expected background of 0.3 event, resulting in an upper limit for the KL→π0π0e+e- branching ratio of 6.6×10-9 at the 90% C.L.
© 2002 The American Physical Society
URL:
http://link.aps.org/doi/10.1103/PhysRevLett.89.211801
DOI:
10.1103/PhysRevLett.89.211801
PACS:
13.25.Es, 11.30.Er, 13.20.Eb, 14.40.Aq
*Permanent address: University of São Paulo, São Paulo, Brazil. †To whom all correspondence should be addressed. ‡Permanent address: C.P.P. Marseille/C.N.R.S., France.
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