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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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dc.contributor.author Dolgov, Alexander D.
dc.contributor.author Pastor Carpi, Sergio
dc.contributor.author Romao, J. C.
dc.contributor.author Furtado Valle, José Wagner
dc.date.accessioned 2015-09-28T07:57:53Z
dc.date.available 2015-09-28T07:57:53Z
dc.date.issued 1997
dc.identifier.citation Dolgov, Alexander D. Pastor Carpi, Sergio Romao, J. C. Furtado Valle, José Wagner 1997 Primordial nucleosynthesis, majorons and heavy tau neutrinos Nuclear Physics B 496 1-2 24 40
dc.identifier.uri http://hdl.handle.net/10550/47307
dc.description.abstract 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.
dc.language.iso eng
dc.relation.ispartof Nuclear Physics B, 1997, vol. 496, num. 1-2, p. 24-40
dc.subject Física
dc.title Primordial nucleosynthesis, majorons and heavy tau neutrinos
dc.type journal article es_ES
dc.date.updated 2015-09-28T07:57:53Z
dc.identifier.doi 10.1016/S0550-3213(97)00213-7
dc.identifier.idgrec 073549
dc.rights.accessRights open access es_ES

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