Precise Nucleosynthesis Limits on Neutrino Masses

Details Precise Nucleosynthesis Limits on Neutrino Masses Precise Nucleosynthesis Limits on Neutrino Masses

1996-08-02

arxiv.org/abs/hep-ph/9608215v1

Physics

High Energy Physics

High Energy Physics - Phenomenology

6 pages, 2 eps-figures. Talk at Neutrino 96

Scientific paper

A computation of nucleosynthesis bounds on the masses of long-lived Dirac and Majorana neutrinos is reviewed. In particular an explicit treatment of the ``differential heating'' of the $\nue$ and $\bnue$ ensembles due to the residual out-of-equilibrium annihilations of decoupled heavy neutrinos is included. The effect is found to be considerably weaker than recently reported by Dolgov et al. For example, the bounds for a Dirac tau neutrino are $\mnt < 0.37$ MeV or $\mnt > 25$ MeV (for $\dNu > 1$), whereas the present laboratory bound is $\mnt < 23.1$ MeV.

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