Precise Measurement of the π+π0e+ν Branching Ratio

D. Počanić et al.
Phys. Rev. Lett. 93, 181803 – Published 25 October 2004

Abstract

Using a large acceptance calorimeter and a stopped pion beam we have made a precise measurement of the rare π+π0e+ν (πβ) decay branching ratio. We have evaluated the branching ratio by normalizing the number of observed πβ decays to the number of observed π+e+ν (πe2) decays. We find the value of Γ(π+π0e+ν)/Γ(total)=[1.036±0.004(stat)±0.004(syst)±0.003(πe2)]×108, where the first uncertainty is statistical, the second systematic, and the third is the πe2 branching ratio uncertainty. Our result agrees well with the standard model prediction.

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  • Received 17 December 2003

DOI:https://doi.org/10.1103/PhysRevLett.93.181803

©2004 American Physical Society

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See Also

Precise Measurement of the Pion Axial Form Factor in the π+e+νγ Decay

E. Frlež et al.
Phys. Rev. Lett. 93, 181804 (2004)

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Vol. 93, Iss. 18 — 29 October 2004

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