New Upper Limits on the Tau Neutrino Mass from Primordial Helium Considerations

Details New Upper Limits on the Tau Neutrino Mass from Primordial Helium Considerations New Upper Limits on the Tau Neutrino Mass from Primordial Helium Considerations

1993-02-23

arxiv.org/abs/hep-ph/9302292v1

Phys.Rev.Lett.71:476-479,1993

Physics

High Energy Physics

High Energy Physics - Phenomenology

9 pages (2 figures available upon request), UM-AC-93-02

Scientific paper

10.1103/PhysRevLett.71.476

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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