Status of the TRIUMF PIENU Experiment

Abstract

The PIENU experiment at TRIUMF aims to measure the pion decay branching ratio $R=\hat{I}“(\ddot{I}{€}^{+}\to e^{+}\hat{I}{½}_e({\hat{I}}^3))/\hat{I}“(\ddot{I}{€}^{+}\to \hat{I}{¼}^{+}\hat{I}{½}_{\hat{I}}¼({\hat{I}}^3))$ with precision $<0.1$% to provide a sensitive test of electron-muon universality in weak interactions. The current status of the PIENU experiment is presented.

Talk presented CIPANP2015. 8 pages, LaTeX, 4 eps figures