Non-thermal leptogenesis via direct inflaton decay without SU(2)(L) triplets

Details Non-thermal leptogenesis via direct inflaton decay without SU(2)(L) triplets Non-thermal leptogenesis via direct inflaton decay without SU(2)(L) triplets

2005-03-23

arxiv.org/abs/hep-ph/0503235v2

Phys.Rev. D72 (2005) 043502

Physics

High Energy Physics

High Energy Physics - Phenomenology

22 pages including 9 figures, uses Revtex, version to appear in PRD

Scientific paper

10.1103/PhysRevD.72.043502

We present a non-thermal leptogenesis scenario following standard supersymmetric hybrid inflation, in the case where light neutrinos acquire mass via the usual seesaw mechanism and inflaton decay to heavy right-handed neutrino superfields is kinematically disallowed, or the right-handed neutrinos which can be decay products of the inflaton are unable to generate sufficient baryon asymmetry via their subsequent decay. The primordial lepton asymmetry is generated through the decay of the inflaton into light particles by the interference of one-loop diagrams with exchange of different right-handed neutrinos. The mechanism requires superpotential couplings explicitly violating a U(1) R-symmetry and R-parity. We take into account the constraints from neutrino masses and mixing and the preservation of the primordial asymmetry. We consider two models, one without and one with SU(2)(R) gauge symmetry. We show that the former is viable, whereas the latter is ruled out. Although the broken R-parity need not have currently observable low-energy signatures, some R-parity-violating slepton decays may be detectable in the future colliders.

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