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Search for Heavy Neutrino in K->mu nu_h(nu_h-> nu gamma) Decay at ISTRA+ Setup

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arxiv 1110.1610 v3 pith:ZKTCTJH3 submitted 2011-10-07 hep-ex

classification hep-ex
keywords decaygammaheavyneutrinoregioncasechaindecaying
verification ladder T0 review T1 audit T2 compute T3 formal

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Heavy neutrino nu_h with m_h < 300MeV/c^2 can be effectively searched for in kaon decays. We put upper limits on mixing matrix element |U_mu_h}|^2 for radiatively decaying nu_h from K->mu nu_h (nu_h -> nu gamma) decay chain in the following parameter region: 30MeV/c^2 < m_h < 80MeV/c^2; 10^{-11}sec < tau_h < 10^{-9}sec. For the whole region |U_{mu h}|^2 < 5 x 10^{-5} for Majorana type of nu_h and | U_{\mu h}|^2 < 8 x 10^{-5} for the Dirac case.

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  1. A frequentist analysis of three right-handed neutrinos with GAMBIT

    hep-ph 2019-08 conditional novelty 7.0 of 10

    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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