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

Abstract

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_{μh}|^2 < 8 x 10^{-5} for the Dirac case.

Published in Phys. Lett. B

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• Search for heavy neutrino in $K^{+}\to {\mu }^{+}{\nu }_H$ decay
• Constraints on electromagnetic properties of sterile neutrinos from MiniBooNE results
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