May 29, 2018 to June 3, 2018
Hyatt Regency Indian Wells Conference Center
US/Pacific timezone

Improved Search for Heavy Neutrinos and a Test of Lepton Universality in the Decay $\pi \to e \nu$

May 29, 2018, 5:30 PM
South Foyer | Ocotillo Room (Hyatt Regency Indian Wells Conference Center)

South Foyer | Ocotillo Room

Hyatt Regency Indian Wells Conference Center

44600 Indian Wells Lane, Indian Wells, CA 92210, USA


Richard Mischke (TRIUMF)


Data from the PIENU experiment at TRIUMF have been examined for evidence of a heavy neutrino coupled to the positron in the decay $\pi \to e \nu$. Limits on the mixing of neutrinos in the mass range 60–135 MeV/$c^2$ with the electron neutrino, which are up to an order of magnitude improvement over previous results, will be presented. The PIENU experiment was also designed to make a high-precision measurement of the $ \pi \to e \nu $ branching ratio: $ R_\pi = \frac{\Gamma(\pi \to e \nu \ + \ \pi \to e \nu \gamma)}{\Gamma(\pi \to \mu \nu \ + \ \pi \to \mu \nu \gamma)}$, which provides a sensitive test of lepton universality and places tight constraints on many new physics scenarios. The branching ratio analysis is in the final stages, and the status will be presented, as well as a summary of published results based on a subset of the data.
E-mail [email protected]
Collaboration name PIENU Collaboration

Primary author

Presentation materials