Search for heavy neutrinos inK+→μ+νHdecays

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Abstract

Evidence of a heavy neutrino, ${\ensuremath{\nu}}_{H}$, in the ${K}^{+}\ensuremath{\rightarrow}{\ensuremath{\mu}}^{+}{\ensuremath{\nu}}_{H}$ decays was sought using the E949 experimental data with an exposure of $1.70\ifmmode\times\else\texttimes\fi{}1{0}^{12}$ stopped kaons. With the major background from the radiative ${K}^{+}\ensuremath{\rightarrow}{\ensuremath{\mu}}^{+}{\ensuremath{\nu}}_{\ensuremath{\mu}}\ensuremath{\gamma}$ decay understood and suppressed, upper limits (90% C.L.) on the neutrino mixing matrix element between the muon and heavy neutrinos, $|{U}_{\ensuremath{\mu}H}{|}^{2}$, were set at the level of $1{0}^{\ensuremath{-}7}$ to $1{0}^{\ensuremath{-}9}$ for the heavy neutrino mass region 175 to $300\text{ }\text{ }\mathrm{MeV}/{c}^{2}$.

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