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An electron antineutrino mass has been measured in tritium beta-decay in the"Troitsk nu-mass" experiment. The setup consists of a windowless gaseoustritium source and an electrostatic electron spectrometer. The whole data setacquired from 1994 to 2004 was reanalysed. A thorough selection of data withthe reliable experimental conditions has been performed. We checked every knownsystematic effect and got the following experimental estimate for neutrino masssquared m_{nu}^{2}=-0.67+/- 2.53 {eV}^{2}. This gives an experimental uppersensitivity limit of m_{nu}<2.2 eV and upper limit estimates m_{nu}<2.12 eV,95% C.L. for Bayesian statistics and m_{nu}<2.05 eV, 95% C.L. for the Feldmanand Cousins approach.

An upper limit on electron antineutrino mass from Troitsk experiment