Leptogenesis in flavor models with type I and II seesaws
Abstract
In type I seesaw models with flavor symmetries accounting for the lepton mixing angles the CP asymmetry in righthanded neutrino decays vanishes in the limit in which the mixing pattern is exact. We study the implications that additional degrees of freedom from type II seesaw may have for leptogenesis in such a limit. We classify in a model independent way the possible realizations of type I and II seesaw schemes, differentiating between classes in which leptogenesis is viable or not. We point out that even with the interplay of type I and II seesaws there are generic classes of minimal models in which the CP asymmetry vanishes. Finally we analyze the generation of the lepton asymmetry by solving the corresponding kinetic equations in the general case of a mild hierarchy between the light righthanded neutrino and the scalar triplet masses. We identify the possible scenarios in which leptogenesis can take place.
 Publication:

Nuclear Physics B
 Pub Date:
 May 2012
 DOI:
 10.1016/j.nuclphysb.2012.01.009
 arXiv:
 arXiv:1112.1843
 Bibcode:
 2012NuPhB.858..196A
 Keywords:

 High Energy Physics  Phenomenology
 EPrint:
 24 pages, 5 figures