A search for massive neutrinos has been made in the decay π+→e+ν. No evidence was found for extra peaks in the positron energy spectrum indicative of pion decays involving massive neutrinos (π→e+νh). Upper limits (90% C.L.) on the neutrino mixing matrix element |Uei|2 in the neutrino mass region 60-135 MeV/c2 were set and are an order of magnitude improvement over previous results.
ASJC Scopus subject areas
- Physics and Astronomy (miscellaneous)