Unstable massive tau neutrinos and primordial nucleosynthesis
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Unstable massive tau neutrinos and primordial nucleosynthesis

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Unstable massive tau neutrinos and primordial nucleosynthesis

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Dolgov, Alexander D.; Hansen, Steen H.; Pastor Carpi, Sergio; Semikoz, Victor B.
Aquest document és un/a article, creat/da en: 1999
The impact of unstable Majorana tau neutrinos on primordial nucleosynthesis is considered. The mass and lifetime of nu_tau are taken in the intervals 0.1-20 MeV and 0.001-400 sec respectively. The studied decay modes are nu_tau -> nu_mu + phi and nu_tau -> nu_e + phi, where phi is a massless (or light) scalar. Integro-differential kinetic equations are solved numerically without any simplifying assumptions. Our results deviate rather strongly from earlier calculations. Depending on mass, lifetime, and decay channels of the nu_tau, the number of effective neutrino species (found from He4), in addition to the 3 standard ones, varies from -2 to +2.5. The abundances of H2 and Li7 are also calculated.

    Dolgov, Alexander D. Hansen, Steen H. Pastor Carpi, Sergio Semikoz, Victor B. 1999 Unstable massive tau neutrinos and primordial nucleosynthesis Nuclear Physics B 548 1-3 385 407
http://dx.doi.org/10.1016/S0550-3213(99)00127-3
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