Phys. Rev. Lett.
80,
4123–4126
(1998)
Measurement of the Branching Fraction of the Decay KL→π+π-e+e-
J. Adams et al. (KTeV Collaboration)
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J. Adams11, 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, G. Graham4, J. Graham4, K. A. Hagan11, E. Halkiadakis10, K. Hanagaki8, M. Hazumi8, S. Hidaka8, Y. B. Hsiung7, V. Jejer11, J. Jennings2, D. A. Jensen7, P. T. Johnson7, R. Kessler4, H. G. E. Kobrak3, J. LaDue5, A. Lath10, A. Ledovskoy11, 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. Ramberg7, R. E. Ray7, A. Ronzhin7, A. Roodman4, M. Sadamoto8, S. Schnetzer10, K. Senyo8, P. Shanahan7, P. S. Shawhan4, W. Slater2, N. Solomey4, S. V. Somalwar10, I. Suzuki8, R. L. Stone10, E. C. Swallow6,4, R. A. Swanson3, S. A. Taegar1, R. J. Tesarek10, G. B. Thomson10, A. Tripathi2, R. Tschirhart7, Y. W. Wah4, 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 28 January 1998; published in the issue dated 11 May 1998
We report the first branching fraction measurement of the decay KL→π+π-e+e-. With a sample of 46 candidates, and an expected background level of 9.4 events, the branching fraction is determined to be B(KL→π+π-e+e-) = [3.2±0.6(stat)±0.4(syst)]×10-7. This measurement was carried out as part of the Fermilab KTeV (E799-II) experiment and is in good agreement with the expectations from the mechanisms of direct emission and inner bremsstrahlung.
© 1998 The American Physical Society
URL:
http://link.aps.org/doi/10.1103/PhysRevLett.80.4123
DOI:
10.1103/PhysRevLett.80.4123
PACS:
13.20.Eb, 11.30.Er, 13.40.Hq, 14.40.Aq
*On leave from C.P.P. Marseille/CNRS, France. †To whom correspondence should be addressed. Electronic address: odell@fnal.gov
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