Search for heavy neutrinos in K^+toμ^+ν_H decays

A.V. Artamonov , B. Bassalleck , B. Bhuyan , E.W. Blackmore , D.A. Bryman , S. Chen , I-H. Chiang , I.-A. Christidi

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P.S. Cooper M.V. Diwan J.S. Frank T. Fujiwara J. Hu J. Ives A.O. Izmaylov D.E. Jaffe S. Kabe S.H. Kettell M.M. Khabibullin A.N. Khotjantsev P. Kitching M. Kobayashi T.K. Komatsubara A. Konaka Yu.G. Kudenko L.G. Landsberg B. Lewis K.K. Li L.S. Littenberg J.A. Macdonald J. Mildenberger O.V. Mineev M. Miyajima K. Mizouchi N. Muramatsu T. Nakano M. Nomachi T. Nomura T. Numao V.F. Obraztsov K. Omata D.I. Patalakha R. Poutissou G. Redlinger T. Sato T. Sekiguchi A.T. Shaikhiev T. Shinkawa R.C. Strand S. Sugimoto Y. Tamagawa R. Tschirhart T. Tsunemi D.V. Vavilov B. Viren Zhe Wang Hanyu Wei N.V. Yershov Y. Yoshimura T. Yoshioka

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classification ✦ hep-ex

keywords heavyneutrinodecaysbackgrounddatadecaye949element

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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/$c^2$.

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Search for heavy neutrinos in K^+toμ^+ν_H decays

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