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arXiv · 1307.2241

Leptogenesis with Lepton-Number-Violating Dirac Neutrinos

Julian Heeck
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Abstract

Dirac neutrinos with lepton-number-violating interactions can give rise to a new leptogenesis mechanism. In its simplest renormalizable realization, based on a gauged B-L symmetry spontaneously broken by four units, the decay of a new scalar creates an asymmetry in the right-handed neutrinos. A neutrinophilic two-Higgs-doublet model converts this asymmetry to the baryons, provides a natural explanation of the small neutrino masses, and can lead to an effective number of relativistic degrees of freedom of N(eff) = 3.29 due to the entropy-suppressed contribution of the right-handed neutrinos.

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Julian Heeck. 2013-10-08. Leptogenesis with Lepton-Number-Violating Dirac Neutrinos. https://doi.org/10.1103/physrevd.88.076004

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