Constraints from primordial nucleosynthesis on the mass of the tau neutrino

Details Constraints from primordial nucleosynthesis on the mass of the tau neutrino Constraints from primordial nucleosynthesis on the mass of the tau neutrino

Jul 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991phrvl..67..533k&link_type=abstract

Physical Review Letters (ISSN 0031-9007), vol. 67, July 29, 1991, p. 533-536. Research supported by DOE and NSF.

Astronomy and Astrophysics

Astrophysics

63

Astrophysics, Neutrinos, Nuclear Fusion, Particle Mass, Weak Energy Interactions, Abundance, Thermodynamic Equilibrium

Scientific paper

It is shown that primordial nucleosynthesis excludes a tau-neutrino mass from 0.3 to 25 MeV (Dirac) and 0.5 to 25 MeV (Majorana) provided that its lifetime is not less than about 1 sec, and from 0.3 to 30 MeV (Dirac) and 0.5 to 32 MeV (Majorana) for a lifetime of not less than about 1000 sec. A modest improvement in the laboratory mass limit - from 35 to 25 MeV - would imply that the tau-neutrino mass must be less than 0.5 MeV (provided the lifetime is not less than about 1 sec).

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