PIENU: a high-precision measurement of the pion branching ratio

Tristan Sullivan (UBC/TRIUMF)
Event Date and Time: 
Mon, 2016-10-31 15:30 - 16:30
TRIUMF Auditorium

The rate at which pions decay into electrons, compared to the rate at which they decay into muons, is an important observable in the Standard Model of particle physics. The value of the branching ratio for the electronic decay mode has been calculated within the Standard Model to be (1.2352 +/- 0.0002) x 10^-4. The PIENU experiment at TRIUMF aims to measure this quantity to a precision of less than 0.1%. This provides a sensitive test of lepton universality, and constrains many new physics scenarios with mass reach up to 1000 TeV. The measurements are also sensitive to the presence of heavy neutrinos. The current state of the analysis of the PIENU data will be presented.

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