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Author Cheu, E. ♦ Taegar, S. A. ♦ Wang, J. ♦ Arisaka, K. ♦ Jennings, J. ♦ Slater, W. ♦ Tripathi, A. ♦ Kobrak, H. G. ♦ Swanson, R. A. ♦ Blucher, E. ♦ Bown, C. ♦ Bright, S. ♦ Graham, G. ♦ Graham, J. ♦ Kessler, R. ♦ Monnier, E. ♦ Prasad, V. ♦ Qiao, C. ♦ Quinn, B. ♦ Roodman, A. ♦ Shawhan, P. S. ♦ Solomey, N. ♦ Swallow, E. C. ♦ Wah, Y. W. ♦ Winstein, B. ♦ Winston, R. ♦ Zimmerman, E. D. ♦ Barker, A. R. ♦ LaDue, J. ♦ Mikelsons, P. ♦ Nauenberg, U. ♦ Toale, P. A. ♦ Wu, J. ♦ Bellantoni, L. ♦ Ben-David, R. ♦ Bock, G. J. ♦ Childress, S. ♦ Coleman, R. ♦ Crisler, M. B. ♦ Ford, R. ♦ Hsiung, Y. B. ♦ Jensen, D. A. ♦ McBride, P. L. ♦ Nakaya, T. ♦ Nguyen, H. ♦ O.`Dell, V. ♦ Pang, M. ♦ Pordes, R. ♦ Ramberg, E. J. ♦ Ray, R. E. ♦ Shanahan, P. ♦ Tschirhart, R. ♦ White, H. B. ♦ Whitmore, J. ♦ Hanagaki, K. ♦ Hidaka, S. ♦ Sadamoto, M. ♦ Senyo, K. ♦ Suzuki, I. ♦ Yamanaka, T. ♦ Bellavance, A. ♦ Corcoran, M. D. ♦ Albuquerque, I. F. ♦ Averitte, S. ♦ Belz, J. ♦ Bergman, D. R. ♦ Halkiadakis, E. ♦ Lath, A. ♦ Schnetzer, S. ♦ Somalwar, S. V. ♦ Stone, R. L. ♦ Tesarek, R. J. ♦ Thomson, G. B. ♦ Arenton, M. ♦ Corti, G. ♦ Cox, B. ♦ Golossanov, A. ♦ Hagan, K. ♦ Jejer, V. ♦ Ledovskoy, A. ♦ McManus, A. P. ♦ Nelson, K. S. ♦ Alavi-Harati, A.
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Language English
Subject Keyword PHYSICS ♦ PIONS NEUTRAL ♦ LEPTONIC DECAY ♦ BRANCHING RATIO ♦ ELECTRONS ♦ POSITRONS ♦ PARTICLE DECAY ♦ PAIR PRODUCTION ♦ CHIRAL SYMMETRY ♦ PERTURBATION THEORY
Abstract The branching ratio of the rare decay {pi}{sup 0}{r_arrow}e{sup +}e{sup {minus}} has been measured in E799-II, a rare kaon decay experiment using the KTeV detector at Fermilab. We observed 275 candidate {pi}{sup 0}{r_arrow}e{sup +}e{sup {minus}} events, with an expected background of 21.4{plus_minus}6.2 events which includes the contribution from Dalitz decays. We measured B[{pi}{sup 0}{r_arrow}e{sup +}e{sup {minus}},thinsp (m{sub e{sup +}e{sup {minus}}}/m{sub {pi}{sup 0}}){sup 2}{gt}0.95]=(6.09{plus_minus} 0.40{plus_minus}0.24){times}10{sup {minus}8} , where the first error is statistical and the second systematic. This result is the first significant observation of the excess rate for this decay above the unitarity lower bound. {copyright} {ital 1999} {ital The American Physical Society }
ISSN 00319007
Educational Use Research
Learning Resource Type Article
Publisher Date 1999-08-01
Publisher Place United States
Journal Physical Review Letters
Volume Number 83
Issue Number 5


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