Consequences of Triplet Seesaw for Leptogenesis

Details Consequences of Triplet Seesaw for Leptogenesis Consequences of Triplet Seesaw for Leptogenesis

2003-07-18

arxiv.org/abs/hep-ph/0307237v2

Phys.Lett.B582:73-81,2004

Physics

High Energy Physics

High Energy Physics - Phenomenology

13 pages; references added, 2 footnotes modified

Scientific paper

10.1016/j.physletb.2003.11.061

We present the various leptogenesis scenarios which may occur if, in addition to the ordinary heavy right-handed neutrinos, there exists a heavy scalar SU(2)_L triplet coupled to leptons. We show that the contributions of the right-handed neutrinos and the triplet to the lepton asymmetry are proportional to their respective contributions to the neutrino mass matrix. A consequence of the triplet contribution to the lepton asymmetry is that there is no more upper bound on the neutrino masses from leptogenesis due to the fact that the neutrino mass constraints do not necessarily induce asymmetry washout effects. We also show how such a triplet leptogenesis mechanism may emerge naturally in the framework of the left-right symmetric theories, such as Pati-Salam or SO(10).

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