Leptogenesis from Split Fermions

Details Leptogenesis from Split Fermions Leptogenesis from Split Fermions

2004-01-11

arxiv.org/abs/hep-ph/0401070v1

JHEP0502:068,2005

Physics

High Energy Physics

High Energy Physics - Phenomenology

4 pages and a figure

Scientific paper

10.1088/1126-6708/2005/02/068

We present a new type of leptogenesis mechanism based on a two-scalar split-fermions framework. At high temperatures the bulk scalar vacuum expectation values (VEVs) vanish and lepton number is strongly violated. Below some temperature, $T_c$, the scalars develop extra dimension dependent VEVs. This transition is assumed to proceed via a first order phase transition. In the broken phase the fermions are localized and lepton number violation is negligible. The lepton-bulk scalar Yukawa couplings contain sizable CP phases which induce lepton production near the interface between the two phases. We provide a qualitative estimation of the resultant baryon asymmetry which agrees with current observation. The neutrino flavor parameters are accounted for by the above model with an additional approximate U(1) symmetry.

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