An upper limit on electron antineutrino mass from Troitsk experiment

by Fyodor Tkachov (INR RAS)

Monday 17 Feb 2014, 17:15 → 18:15 Europe/Zurich

EPFL, Cubotron 727

An electron antineutrino mass has been measured in tritium beta-decay in the quot;Troitsk nu-massquot; experiment. The setup consists of a windowless gaseous tritium source and an electrostatic electron spectrometer. The whole data set ac•quired from 1994 to 2004 was reanalysed. A thorough selection of data with the reliable experimental conditions has been performed. We checked every known sys•tematic e•ect and got the following experimental estimate for neutrino mass squared m• 2 = •0.67 ± 2.53 eV2 . This gives an experimental upper sensitivity limit of m• < 2.2 eV and upper limit estimates m• < 2.12 eV, 95% C.L. for Bayesian statistics and m• < 2.05 eV, 95% C.L. for the Feldman and Cousins approach.