Precision Measurement of the $\pi$$^+$$\rightarrow$$e^+$$\nu$$_e$ Branching Ratio in the PIENU Experiment
S. Ito*,
A. Aguilar-Arevalo,
M. Aoki,
M. Blecher,
D. I. Britton,
D. A. Bryman,
D. vom Bruch,
S. Chen,
J. Comfort,
S. Cuen-Rochin,
L. Doria,
P. Gumplinger,
A. Husseina,
Y. Igarashi,
S. Kettell.,
L. Kurchaninov,
L. Littenberg,
C. Malbrunot,
R. E. Mischke,
T. Numao,
D. Protopopescu,
A. Sher,
T. Sullivan and
D. Vavilov*: corresponding author
Pre-published on:
November 22, 2017
Published on:
November 24, 2017
Abstract
The PIENU experiment at TRIUMF aims to measure the branching ratio of the pion decay modes $R^{\pi}=[{\pi}^+{\rightarrow}e^+{\nu}_e({\gamma})]/[{\pi}^+{\rightarrow}{\mu}^+{\nu}_{\mu}({\gamma})]$ with precision of $<0.1\%$.
Precise measurement of $R^{\pi}$ provides a stringent test of electron-muon universality in weak interactions. The current status of the PIENU experiment and future prospects are presented.
DOI: https://doi.org/10.22323/1.294.0034
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