Measurement of the pion branching ratio at TRIUMF

C Malbrunot ,M Blecher,S H Kettell,Y Kuno,P Gumplinger,Y Igarashi,T Sullivan,T Numao,A A Aguilar-Arevalo ,L L Kurchaninov ,D Britton ,M Aoki ,A Sher ,A Hussein ,L Doria ,D A Bryman ,S Chen ,L Littenberg ,Mingyu Ding ,D Vavilov ,J.r Comfort ,Shin Ito ,Masato Yoshida

doi:10.1063/1.3700618

Measurement of the pion branching ratio at TRIUMF

C Malbrunot , M Blecher + Show 21 more

https://doi.org/10.1063/1.3700618

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Publication Date: Jan 1, 2012

Citations: 2

Affiliation: University of British Columbia, Virginia Tech, Brookhaven National Laboratory, Osaka University, TRIUMF, High Energy Accelerator Research Organization, Instituto Nacional de Investigaciones Nucleares, University of Glasgow, University of Northern British Columbia, Tsinghua University, Arizona State University

#Universality In Weak Interactions #Branching Ratio + Show 8 more

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Abstract

The branching ratio of pion decays, R = Γ(π+→e+νe+π+→e+νeγ)Γ(π+→μ+νμ+π+→μ+νμγ is one of the most accurately calculated decay processes involving hadrons and has provided one of the most stringent tests of the hypothesis of electron-muon universality in weak interactions. The current experimental branching ratio Rexp = (1.230±0.004)×10−4 is 40 times less precise than the theoretical prediction RSM = 1.2352(1)10−4. The TRIUMF PIENU experiment aims at measuring the pion branching ratio with a precision improved by at least a factor five.

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