Leptogenesis with Lepton-Number-Violating Dirac Neutrinos

Heeck, Julian

doi:10.1103/PhysRevD.88.076004

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Leptogenesis with Lepton-Number-Violating Dirac Neutrinos

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Heeck, Julian
Werner Rodejohann - ERC Starting Grant, Junior Research Groups, MPI for Nuclear Physics, Max Planck Society;

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Heeck, J. (2013). Leptogenesis with Lepton-Number-Violating Dirac Neutrinos. Physical Review D, 88(7): 076004. doi:10.1103/PhysRevD.88.076004.

Cite as: https://hdl.handle.net/11858/00-001M-0000-0014-7263-3

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.