Sphaleron-induced baryon-number nonconservation and a constraint on Majorana neutrino masses

Details Sphaleron-induced baryon-number nonconservation and a constraint on Majorana neutrino masses Sphaleron-induced baryon-number nonconservation and a constraint on Majorana neutrino masses

Aug 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990phrvd..42.1285f&link_type=abstract

Physical Review D (Particles and Fields), Volume 42, Issue 4, 15 August 1990, pp.1285-1286

Physics

136

Scientific paper

We point out that the baryon-number asymmetry in the Universe is erased by the sphaleron effect just below the electroweak phase transition irrespective of the primordial baryon- and lepton-number asymmetry, if there exists a Majorana-type interaction. The requirement to avoid this happening leads to the condition that mν (Majorana) <50 keV for all species of neutrinos, regardless of whether or not neutrinos are stable.

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