@article{7097928cb04646eebdd39807aa8188b9,
title = "Precise measurement of the π+ → π0e + ν branching ratio",
abstract = "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.",
author = "D. Po{\v c}ani{\'c} and E. Frle{\v z} and Baranov, {V. A.} and W. Bertl and Ch Br{\"o}nnimann and M. Bychkov and Crawford, {J. F.} and M. Daum and Khomutov, {N. V.} and Korenchenko, {A. S.} and Korenchenko, {S. M.} and T. Kozlowski and Kravchuk, {N. P.} and Kuchinsky, {N. A.} and W. Li and Minehart, {R. C.} and D. Mzhavia and Barry Ritchie and S. Ritt and Rozhdestvensky, {A. M.} and Sidorkin, {V. V.} and Smith, {L. C.} and I. Supek and Z. Tsamalaidze and VanDevender, {B. A.} and Y. Wang and Wirtz, {H. P.} and Ziock, {K. O H}",
note = "Funding Information: We thank W. A. Stephens, Z. Hochman, and the PSI experimental support group for invaluable help in preparing and running the experiment. This work has been supported by the U.S. National Science Foundation, the U.S. Department of Energy, the Paul Scherrer Institute, and the Russian Foundation for Basic Research.",
year = "2004",
month = oct,
day = "29",
doi = "10.1103/PhysRevLett.93.181803",
language = "English (US)",
volume = "93",
pages = "181803--1--181803--4",
journal = "Physical Review Letters",
issn = "0031-9007",
publisher = "American Physical Society",
number = "18",
}