Leptogenesis in neutrinophilic Higgs doublet models
نویسندگان
چکیده
In a class of two Higgs doublet model, where one Higgs doublet generates masses of quarks and charged leptons whereas the other Higgs doublet with a tiny vacuum expectation value(VEV) generates neutrino Dirac masses, thermal leptogenesis suitably works at low energy scale as keeping no enhancement of lepton number violating washout effects. In addition, Thermal leptogenesis in a supersymmetric neutrinophilic Higgs model also similarly works. The mass of the lightest righthanded (s)neutrino can be reduced to be O(105) GeV as keeping sufficiently large CP asymmetry in its decay. Therefore, the reheating temperature after inflation is not necessarily high, hence this scenario is free from gravitino problem.
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