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

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 $pi^+ rightarrow mbox{e}^+ u$ branching ratio measurement is summarized.