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Aguilar-Arevalo, A.; Aoki, M.; Blecher, M.; Britton, D.I.; vom Bruch, D.; Bryman, D.A.; Chen, S.; Comfort, J.; Doria, L.; Cuen-Rochin, S.; Gumplinger, P.; Hussein, A.; Igarashi, Y.; Ito, S.; Kettell, S.H.; Kurchaninov, L.; Littenberg, L.S.; Malbrunot, C.; Mischke, R.E.; Numao, T.; Protopopescu, D.; Sher, A.; Sullivan, T.; Vavilov, D.
Physics letters. B, 11/2019, Letnik: 798Journal Article
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 |Uμi|2 in the neutrino mass region of 15.7–33.8 MeV/c2, improving on previous results by an order of magnitude.
