Precise measurement of the π+ → π0e + ν branching ratio

D. Počanić, E. Frlež, V. A. Baranov, W. Bertl, Ch Brönnimann, M. Bychkov, J. F. Crawford, M. Daum, N. V. Khomutov, A. S. Korenchenko, S. M. Korenchenko, T. Kozlowski, N. P. Kravchuk, N. A. Kuchinsky, W. Li, R. C. Minehart, D. Mzhavia, Barry Ritchie, S. Ritt, A. M. RozhdestvenskyV. V. Sidorkin, L. C. Smith, I. Supek, Z. Tsamalaidze, B. A. VanDevender, Y. Wang, H. P. Wirtz, K. O H Ziock

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132 Scopus citations


The rare π+→π0e+v (πβ) decay branching ratio was calculated using a large acceptance calorimeter and a stopped pion beam. The branching ratio was evaluated by normalizing the number of observed πβ decays to the number of observed π+→e+v(πe2) decays. The PIBETA experiment, which is a program of precise measurements of the rare pion and muon decays, was performed. The results confirmed the validity of the radiative corrections for the process at the level of 4σexp.

Original languageEnglish (US)
Article number181803
Pages (from-to)181803-1-181803-4
JournalPhysical Review Letters
Issue number18
StatePublished - Oct 29 2004

ASJC Scopus subject areas

  • General Physics and Astronomy


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