Journal article

Warped leptogenesis with Dirac neutrino masses

Tony Gherghetta, Kenji Kadota, Masahide Yamaguchi

PHYSICAL REVIEW D | AMER PHYSICAL SOC | Published : 2007

Abstract

We show how leptogenesis can occur at the TeV scale with neutrinos that possess almost purely Dirac masses and negligible Majorana mass contributions as a consequence of the small wave-function overlap in a warped fifth dimension. Lepton-number violation at the Planck scale is introduced via a Majorana mass term on the Planck brane. Such a Majorana mass operator leads to the small mass splitting of otherwise degenerate Kaluza-Klein excited states on the TeV brane. This tiny mass splitting can compensate for the small Yukawa couplings to give a CP asymmetry large enough to produce the sufficient baryon asymmetry from the decay of the nearly degenerate neutrino Kaluza-Klein states. In this way..

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University of Melbourne Researchers