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, A. K. Skasyrskaya
Institute for Nuclear Research of the RAS, 117312 Moscow, Russia
Abstract
We performed a search for any sign of an additional neutrino mass state in
β-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
neutrino is around or less than 1