Abstract

The PIENU experiment at TRIUMF aims to measure the pion decay branching ratio R=Γ(π+→e+νe(γ))/Γ(π+→μ+νμ(γ))R=Γ(π^+{\rightarrow}e^+ν_e(γ))/Γ(π^+{\rightarrow}μ^+ν_μ(γ)) with precision <0.1<0.1% to provide a sensitive test of electron-muon universality in weak interactions. The current status of the PIENU experiment is presented.

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