An improved cosmological bound on the tau-neutrino mass

Details An improved cosmological bound on the tau-neutrino mass An improved cosmological bound on the tau-neutrino mass

1996-02-06

arxiv.org/abs/hep-ph/9602233v1

Phys.Lett.B383:193-198,1996

Physics

High Energy Physics

High Energy Physics - Phenomenology

10 pages, LaTex file + 1 figure compressed using uufiles

Scientific paper

10.1016/0370-2693(96)00718-6

We consider the influence of non-equilibrium electronic neutrinos (and anti-neutrinos) on the neutron-to-proton ratio. These neutrinos would come from massive $\nu_\tau$ annihilations $\bar \nu_\tau \nu_\tau \rightarrow \bar \nu_e \nu_e$. For sufficiently large $\nu_\tau$ masses this new effect would strongly enhance the (n/p)-ratio, leading to a very stringent bound on the $\nu_\tau$ mass, even adopting a rather weak upper bound on the effective number on neutrino species during nucleosynthesis.

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