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First measeurements in search for keV-sterile neutrino in tritium beta-decay by Troitsk nu-mass experiment

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arxiv 1703.10779 v2 pith:6E55LZ3E submitted 2017-03-31 hep-ex physics.ins-det

J.N. Abdurashitov , A.I. Belesev , V.G. Chernov , E.V. Geraskin , A.A. Golubev , P.V. Grigorieva , G.A. Koroteev , N.A. Likhovid
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A.A. Nozik V.S. Pantuev V.I. Parfenov A.K. Skasyrskaya I.I. Tkachev S.V. Zadorozhny
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classification hep-exphysics.ins-det
keywords neutrinobeta-decayfirstheavylimitsmassrangespectrum
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We present the first measurements of tritium beta-decay spectrum in the electron energy range 16-18.6 keV. The goal is to find distortions which may correspond to the presence of a heavy sterile neutrinos. A possible contribution of this kind would manifest itself as a kink in the spectrum with a similar shape but with end point shifted by the value of a heavy neutrino mass. We set a new upper limits to the neutrino mixing matrix element U^2_{e4} which improve existing limits by a factor from 2 to 5 in the mass range 0.1-2 keV.

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  1. Probing the 3+1 neutrino model in the SHiP experiment

    hep-ph 2025-05 conditional novelty 5.0 of 10

    SHiP with a far detector at 120 m is projected to reach |U_alpha4|^2 ~ 10^-2 near Delta m^2_41 ~ 10^3 eV^2, exceeding current muon and tau mixing limits.

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