New upper limits on the tau-neutrino mass from primordial helium considerations
- 26 July 1993
- journal article
- Published by American Physical Society (APS) in Physical Review Letters
- Vol. 71 (4) , 476-479
- https://doi.org/10.1103/physrevlett.71.476
Abstract
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 life-time is longer than $O(100~sec)$, the constraint $N_{eff}<3.6$ rules out $\nu_{\tau}$ masses in the range $0.5~(MeV)
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