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 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 due to the entropy-suppressed contribution of the right-handed neutrinos.
- Received 15 July 2013
DOI:https://doi.org/10.1103/PhysRevD.88.076004
© 2013 American Physical Society