Abstract
In this paper we present the details of our previously published results for the search for an additional neutrino mass state in the β-electron spectrum from the Troitsk nu-mass experiment. Here we present the steps of the analysis and show a set of likelihood functions obtained for each additional heavy mass value. We demonstrate how systematic errors were estimated. We also compare our results with those published recently for a similar analysis for Mainz data and try to explain why there is a factor of 2–3 difference in the sensitivity for an additional heavy mass.
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