Resonant leptogenesis with mild degeneracy

Abstract

Under the assumption of hierarchical right-handed neutrino masses, masses of right-handed neutrinos must be larger than $10^8$ GeV in the standard thermal leptogenesis scenario, while the mass can be reduced to around 5 TeV in a neutrinophilic two Higgs doublet model. On the other hand, resonant leptogenesis can work with the masses of TeV-scale. However, necessary degeneracy between the lightest and the second lightest right-handed neutrino masses means unnatural fine-tuning of the order of $10^9$. In this paper, we will investigate the resonant leptogenesis scenario in a neutrinophilic two Higgs doublet model. We will find the mass can be reduced to 2 TeV and the degeneracy becomes much milder as of the order of $10^4$. We will also show that degenerate mass spectrum of active neutrinos is disfavored in this setup.

15 pages, 8 figures, Phys. Rev. D published version, references and dicsussion added, typos corrected

References in corpus (6)

• Flavour Matters in Leptogenesis
• Signatures for Majorana neutrinos at hadron colliders
• Heavy neutrino signals at large hadron colliders
• A New Two Higgs Doublet Model
• LHC phenomenology of a two-Higgs-doublet neutrino mass model
• Low scale thermal leptogenesis in neutrinophilic Higgs doublet models

Cited by in corpus (5)

• Flavour Covariant Transport Equations: an Application to Resonant Leptogenesis
• Light Dirac right-handed sneutrino dark matter
• Large invisible decay of a Higgs boson to neutrinos
• Phenomenology in supersymmetric neutrinophilic Higgs model with sneutrino dark matter
• Testable Flavored TeV-scale Resonant Leptogenesis with MeV-GeV Dark Matter in a Neutrinophilic 2HDM