Measurement of the branching ratio of π0 → e+e- using KL → 3π0 decays in flight

A. Alavi-Harati, I. F. Albuquerque, T. Alexopoulos, M. Arenton, K. Arisaka, S. Averitte, A. R. Barker, L. Bellantoni, A. Bellavance, J. Belz, R. Ben-David, D. R. Bergman, E. Blucher, G. J. Bock, C. Bown, S. Bright, E. Cheu, S. Childress, R. Coleman, M. D. CorcoranG. Corti, B. Cox, M. B. Crisler, A. R. Erwin, R. Ford, A. Golossanov, G. Graham, J. Graham, K. Hagan, Eva Halkiadakis, K. Hanagaki, S. Hidaka, Y. B. Hsiung, V. Jejer, J. Jennings, D. A. Jensen, R. Kessler, H. G.E. Kobrak, J. La Due, Amitabh Lath, A. Ledovskoy, P. L. Mc Bride, A. P. Mc Manus, P. Mikelsons, E. Monnier, T. Nakaya, U. Nauenberg, K. S. Nelson, H. Nguyen, V. O’dell, M. Pang, R. Pordes, V. Prasad, C. Qiao, B. Quinn, E. J. Ramberg, R. E. Ray, A. Roodman, M. Sadamoto, Stephen Schnetzer, K. Senyo, P. Shanahan, P. S. Shawhan, W. Slater, N. Solomey, Sunil Somalwar, R. L. Stone, I. Suzuki, E. C. Swallow, R. A. Swanson, S. A. Taegar, R. J. Tesarek, G. B. Thomson, P. A. Toale, A. Tripathi, R. Tschirhart, Y. W. Wah, J. Wang, H. B. White, J. Whitmore, B. Winstein, R. Winston, J. Y. Wu, T. Yamanaka, E. D. Zimmerman

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Abstract

The branching ratio of the rare decay π0 → e+e- has been measured in E799-II, a rare kaon decay experiment using the KTeV detector at Fermilab. We observed 275 candidate π0 → e+e- events, with an expected background of 21.4 ± 6.2 events which includes the contribution from Dalitz decays. We measured B[π0 → e+e-,(me+e-/mπ0)2 > 0.95] = (6.09 ± 0.40 ± 0.24) × 10-8, 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.

Original languageEnglish (US)
Pages (from-to)922-925
Number of pages4
JournalPhysical review letters
Volume83
Issue number5
DOIs
StatePublished - Jan 1 1999

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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