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Primordial nucleosynthesis, majorons and heavy tau neutrinos

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Primordial nucleosynthesis, majorons and heavy tau neutrinos

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Dolgov, Alexander D.; Pastor Carpi, Sergio; Romao, J. C.; Furtado Valle, José Wagner

Aquest document és un/a article, creat/da en: 1997

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 Neq 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 Neq≤3 in the nu-tau mass region 1-10 MeV, for very reasonable values of g≥3×10−4. 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.

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