Warped Leptogenesis with Dirac Neutrino Masses

Details Warped Leptogenesis with Dirac Neutrino Masses Warped Leptogenesis with Dirac Neutrino Masses

2007-05-12

arxiv.org/abs/0705.1749v2

Phys.Rev.D76:023516,2007

Physics

High Energy Physics

High Energy Physics - Phenomenology

Typos corrected

Scientific paper

10.1103/PhysRevD.76.023516

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 wavefunction 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 the standard baryogenesis via leptogenesis scenario can naturally occur at the TeV scale without the need for a high mass scale.

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