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Search for Massive Neutrinos in the Decay pi --> e nu
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Evidence of massive neutrinos in the pi --> e nu decay spectrum was sought with the background pi --> mu --> e decay chain highly suppressed. Upper limits (90% C.L.) on the neutrino mixing matrix element |U_ei|^2 in the neutrino mass region 60--129 MeV/c^2 were set at the level of 10^-8.
Forward citations
Cited by 2 Pith papers
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A frequentist analysis of three right-handed neutrinos with GAMBIT
A comprehensive frequentist global fit maps the currently allowed mass and mixing space for three right-handed neutrinos between 60 MeV and 500 GeV and finds no significant new physics.
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Constraining axion-like particles from rare pion decays
Existing PIENU and PIBETA rare pion decay data constrain ALP-pion mixing to sin^2 theta below about 1e-5 for ALP masses from 10 MeV to the pion mass.
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