Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1996-10-28
Nucl.Phys.B496:24-40,1997
Physics
High Energy Physics
High Energy Physics - Phenomenology
20 pages, LaTex + 6 ps figures. Discussion of the majoron couplings is clarified in new appendix. To be published in NPB
Scientific paper
10.1016/S0550-3213(97)00213-7
We determine the restrictions imposed by primordial nucleosynthesis upon a heavy tau neutrino, in the presence of nu-tau annihilations into Majorons, as expected in a wide class of particle physics models of neutrino mass. We determine the equivalent number of light neutrino species $N_{eq}$ as a function of nu-tau mass and the nu-tau-Majoron coupling $g$. We show that for theoretically plausible $g$ values $\gsim 10^{-4}$ present nucleosynthesis observations can not rule out nu-tau masses in the MeV range. Moreover, these models give $N_{eq} \leq 3$ in the nu-tau mass region 1-10 MeV, for very reasonable values of $g \geq 3 \times 10^{-4}$. The evasion of the cosmological limits brings new interest to the improvement of the present laboratory limit on the nu-tau mass which can be achieved at a tau-charm factory.
Dolgov Alexander. D.
Pastor Sergio
Romão Jorge C.
Valle Jose W. F.
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