No abstract

An electron antineutrino mass has been measured in tritium β-decay in the Troitsk ν-mass experiment. The setup consists of a windowless gaseous tritium source and an electrostatic electron spectrometer. The whole data set acquired from 1994 to 2004 was reanalyzed. A thorough selection of data with the reliable experimental conditions has been performed. We checked every known systematic effect and obtained the following experimental estimate for neutrino mass squared m 2 ν = −0.67 ± 2.53 eV 2 . This gives an experimental upper sensitivity limit of mν < 2.2 eV , 95% C . L. and upper limit estimates mν < 2.12 eV , 95% C .L. for Bayesian statistics and mν < 2.05 eV , 95% C .L. for the Feldman and Cousins approach.

No abstract

No abstract

No abstract