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.
ASJC Scopus subject areas
- Physics and Astronomy(all)