Status of the TRIUMF PIENU Experiment

S. Ito, A. Aguilar-Arevalo, M. Aoki +21

The PIENU experiment at TRIUMF aims to measure the pion decay branching ratio $R=\Gamma ({\pi }^{+}\to e^{+}{\nu }_e(\gamma ))/\Gamma ({\pi }^{+}\to {\mu }^{+}{\nu }_{\mu }(\gamma ))$ with precision $<0.1$% to provide a sens…