Neutrino Masses and GUT Baryogenesis

Details Neutrino Masses and GUT Baryogenesis Neutrino Masses and GUT Baryogenesis

2004-04-15

arxiv.org/abs/hep-ph/0404124v1

Physics

High Energy Physics

High Energy Physics - Phenomenology

Talk presented at AHEP2003, Valencia, Spain, October 2003

Scientific paper

We reconsider the GUT-baryogenesis mechanism for generating the baryon asymmetry of the Universe. The baryon asymmetry is produced by the out of equilibrium decay of coloured Higgs bosons at the GUT scale, conserving B-L. If neutrinos are Majorana particles, lepton number violating interactions erase the lepton number excess, but part of the baryon asymmetry may be preserved, provided those interactions are not in thermal equilibrium when the sphaleron processes become effective, at $T \sim 10^{12}~ GeV$. We analyse whether this mechanism for baryogenesis is feasible in a variety of GUT models of fermion masses proposed in the literature, based on horizontal symmetries.

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