Search for heavy neutrinos in $K^{+}\to {\mu }^{+}{\nu }_H$ decays

Abstract

Evidence of a heavy neutrino, ${\nu }_H$, in the $K^{+}\to {\mu }^{+}{\nu }_H$ decays was sought using the E949 experimental data with an exposure of $1.70\times 10^{12}$ stopped kaons. With the major background from the radiative $K^{+}\to {\mu }^{+}{\nu }_{\mu }\gamma$ decay understood and suppressed, upper limits (90% C.L.) on the neutrino mixing matrix element between muon and heavy neutrino, $|U_{\mu H}{|}^2$, were set at the level of $10^{-7}$ to $10^{-9}$ for the heavy neutrino mass region 175 to 300 MeV/$c^2$.

arXiv comment14 pages, 13 figures; accepted by Physical Review D

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