Mainz 2014 – scientific programme
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T: Fachverband Teilchenphysik
T 41: Neutrinophysik (Theorie)
T 41.1: Talk
Monday, March 24, 2014, 16:45–17:00, P108
New Dirac Leptogenesis — •Julian Heeck — Max-Planck-Institut für Kernphysik, Heidelberg, Germany
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 Neff = 3.29 due to the entropy-suppressed contribution of the right-handed neutrinos.