Cosmological bound on Dirac neutrino mass via γγ-->π0-->νν¯

Details Cosmological bound on Dirac neutrino mass via γγ-->π0-->νν¯ Cosmological bound on Dirac neutrino mass via γγ-->π0-->νν¯

Nov 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991phrvd..44.3345l&link_type=abstract

Physical Review D (Particles, Fields, Gravitation, and Cosmology), Volume 44, Issue 10, 15 November 1991, pp.3345-3347

Mathematics

Logic

21

Scientific paper

Cosmological production of massive right-handed Dirac neutrinos via the pion-pole mechanism, γγ-->π0-->νν¯, is considered. Using the upper bound on the effective number of neutrino species during primordial nucleosynthesis, we obtain a limit on the branching ratio for the decay π0-->νν¯, R<2.9×10-13, and an upper bound on the mass of Dirac neutrinos, mν<420 keV.

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