Improved Search for Heavy Neutrinos and a Test of Lepton Universality in the Decay $π^+ \rightarrow \mbox{e}^+ ν$

Abstract

Two results from the PIENU Experiment are presented reporting a test of lepton universality in pion decay and improved limits on heavy neutrinos coupling to positrons. The status of the full analysis for the $π^+ \rightarrow \mbox{e}^+ ν$ branching ratio measurement is summarized.

Talk presented CIPANP2018. 7 pages, LaTeX, 8 eps figures