An upper limit on additional neutrino mass eigenstate in 2 to 100 eV region from "Troitsk nu-mass" data

A. A. Golubev; A. A. Nozik; A. I. Belesev; A. I. Berlev; A. K. Skasyrskaya; E. V. Geraskin; N. A. Likhovid; V. I. Parfenov; V. S. Pantuev

arxiv: 1211.7193 · v2 · pith:VNAQDFYWnew · submitted 2012-11-30 · ✦ hep-ex · hep-ph

An upper limit on additional neutrino mass eigenstate in 2 to 100 eV region from "Troitsk nu-mass" data

A. I. Belesev , A. I. Berlev , E. V. Geraskin , A. A. Golubev , N. A. Likhovid , A. A. Nozik , V. S. Pantuev , V. I. Parfenov

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A. K. Skasyrskaya

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classification ✦ hep-ex hep-ph

keywords massdataneutrinoadditionaleigenstateelectronlimitnu-mass

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We performed a search for any sign of an additional neutrino mass state in beta-electron spectrum based on data reanalysis of direct electron antineutrino mass measurements in Tritium beta-decay in the Troitsk nu-mass experiment. The existing data set allows us to search for such a state in the mass range up to 100 eV. The lowest value at a 95% C.L. upper limit for the contribution of a heavy eigenstate into electron neutrino is around or less than 1% for masses above 20 eV.

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