Preserving the Lepton Asymmetry in the Brane World

Details Preserving the Lepton Asymmetry in the Brane World Preserving the Lepton Asymmetry in the Brane World

2002-08-30

arxiv.org/abs/hep-ph/0209003v2

Phys.Lett.B549:194-203,2002

Physics

High Energy Physics

High Energy Physics - Phenomenology

13 pages, latex, 2 eps figure clarifications and reference added

Scientific paper

10.1016/S0370-2693(02)02902-7

In models where the Standard Model spectrum is localized on a brane embedded in a higher dimensional spacetime, we discuss the lepton number violation induced by the emission of right-handed neutrinos from the brane. We show that quite generically the presence of the right-handed neutrinos in the bulk leads to rapid lepton number violating processes which above the electroweak scale would wash away any prior lepton or baryon asymmetry. In order to preserve the lepton asymmetry, the brane-bulk couplings for at least one lepton flavor must be extremely suppressed. We show that this has a natural interpretation in the brane world.

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