Measurement of the rare decay π0→e+e-

E. Abouzaid, M. Arenton, A. R. Barker, L. Bellantoni, A. Bellavance, E. Blucher, G. J. Bock, E. Cheu, R. Coleman, M. D. Corcoran, B. Cox, A. R. Erwin, C. O. Escobar, A. Glazov, A. Golossanov, R. A. Gomes, P. Gouffon, K. Hanagaki, Y. B. Hsiung, H. HuangD. A. Jensen, R. Kessler, K. Kotera, A. Ledovskoy, P. L. McBride, E. Monnier, K. S. Nelson, H. Nguyen, R. Niclasen, D. G. Phillips, H. Ping, X. R. Qi, E. J. Ramberg, R. E. Ray, M. Ronquest, E. Santos, J. Shields, W. Slater, D. Smith, N. Solomey, E. C. Swallow, P. A. Toale, R. Tschirhart, C. Velissaris, Y. W. Wah, J. Wang, H. B. White, J. Whitmore, M. J. Wilking, B. Winstein, R. Winston, E. T. Worcester, M. Worcester, T. Yamanaka, E. D. Zimmerman, R. F. Zukanovich

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The branching ratio of the rare decay π0→e+e- has been measured precisely, using the complete data set from the KTeV E799-II experiment at Fermilab. We observe 794 candidate π0→e+e- events using KL→3π0 as a source of tagged π0s. The expected background is 52.7±11.2 events, predominantly from high e+e- mass π0→e+e-γ decays. We have measured B(π0→e+e-,(me+e-/mπ0)2>0.95)=(6.44±0. 25stat±0.22syst)×10-8, which is above the unitary bound from π0→γγ and within the range of theoretical expectations from the standard model.

Original languageEnglish (US)
Article number012004
JournalPhysical Review D - Particles, Fields, Gravitation and Cosmology
Issue number1
StatePublished - 2007
Externally publishedYes


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