Leptogenesis with Composite Neutrinos

Details Leptogenesis with Composite Neutrinos Leptogenesis with Composite Neutrinos

2008-11-06

arxiv.org/abs/0811.0871v1

JHEP 0812:016,2008

Physics

High Energy Physics

High Energy Physics - Phenomenology

20 pages, 4 figures

Scientific paper

10.1088/1126-6708/2008/12/016

Models with composite singlet neutrinos can give small Majorana or Dirac masses to the active neutrinos. The mechanism is based on the fact that conserved chiral symmetries give massless neutrinos at the renormalizable level. Thus, they acquire very small masses due to non-renormalizable terms. We investigate such models in two aspects. First, we find UV completions for them and then we investigate the possibility of giving leptogenesis. We find that these models offer new possibilities for leptogenesis. Models with Majorana masses can exhibit standard leptogenesis. Models with Dirac masses can provide a realization of Dirac type leptogenesis with mass scale that can be as low as 10 TeV.

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