Phys. Rev. Lett. 71, 476–479 (1993)New upper limits on the tau-neutrino mass from primordial helium considerationsReceived 15 March 1993; published in the issue dated 26 July 1993 In this paper we reconsider recently derived bounds on MeV tau neutrinos, taking into account previously unaccounted for effects. We find that, assuming that the neutrino lifetime is longer than ∼100 sec, the constraint Neff<3.6 rules out ντ masses in the range 0.5<mντ<35 MeV for Majorana and 0.3<mντ<35 MeV for Dirac neutrinos. Given that the present laboratory upper bound is 31 MeV, our results imply an upper bound of 0.5 MeV for Majorana neutrinos and of 0.3 MeV for Dirac neutrinos. © 1993 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.71.476
DOI:
10.1103/PhysRevLett.71.476
PACS:
98.80.Ft, 12.15.Ff, 14.60.Gh, 98.80.Cq
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