MODEL INDEPENDENT CONSTRAINTS OF THE AVERAGED NEUTRINO MASSES REVISITED

Abstract

Averaged neutrino masses defined by [Formula: see text] are reanalyzed using up-to-date observed MNS parameters and neutrino masses by the neutrino oscillation experiments together with the cosmological constraint on neutrino masses. The values of 〈mν〉ab are model-independently evaluated in terms of effective neutrino mass defined by [Formula: see text] which is observable in the single beta decay. We obtain lower bound for 〈mν〉ee in the inverted hierarchy (IH) case, 17 meV ≤〈mν〉ee and one for 〈mν〉τμ in the normal hierarchy (NH) case, 5 meV ≤〈mν〉τμ. We also obtain that all the averaged masses 〈mν〉ab have upper bounds which are at most 80 meV.