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Search for heavy neutrinos in π → μν decay
Physics Letters B
In the present work of the PIENU experiment, heavy neutrinos were sought in pion decays π + → μ + ν at rest by examining the observed muon energy spectrum for extra peaks in addition to the expected peak for a light neutrino. No evidence for heavy neutrinos was observed. Upper limits were set on the neutrino mixing matrix |U μi | 2 in the neutrino mass region of 15.7-33.8 MeV/c 2 , improving on previous results by an order of magnitude.doi:10.1016/j.physletb.2019.134980 fatcat:efcsbo6kirbxrl4vl6ldlei3q4