Measurement of the $π^{+} \to e^{+} ν$ branching ratio

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1 January 1994

journal article
research article
Published by American Physical Society (APS) in Physical Review D

Vol. 49 (1) , 28-39
https://doi.org/10.1103/physrevd.49.28

Abstract

A measurement of the

π^{+} \to e^{+} ν

branching ratio gives

R_{π e ν} = \frac{Γ (π \to e ν + π \to e ν γ)}{Γ (π \to μ ν + π \to μ ν γ)} = 1.2265 \pm 0.0034 (stat) \pm 0.0044 (sys) \times 10^{- 4}

. This result is in agreement with standard model calculations and confirms the hypothesis of electron-muon universality at the 0.2% level.

Keywords

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