Low Scale Thermal Leptogenesis in Neutrinophilic Higgs Doublet Models(Particles and Fields)

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概要

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• It is well-known that leptogenesis in low energy scale is difficult in the conventional Type-I seesaw mechanism with hierarchical right-handed neutrino masses. We show that 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 generates neutrino Dirac masses, large Yukawa couplings lead to a large enough CP asymmetry of the right-handed neutrino decay. Thermal leptogenesis suitably works at the low energy scale as keeping no enhancement of lepton number violating wash-out effects. We will also point out that thermal leptogenesis works well without confronting the gravitino problem in a supersymmetric neutrinophilic Higgs doublet model with gravity mediated supersymmetry breaking. Neutralino dark matter and baryon asymmetry generation by thermal leptogenesis are easily compatible in our setup.

• 2011-06-25

著者

• Haba Naoyuki

  Department Of Physics Osaka University

• Haba Naoyuki

  Department Of Physics Nagoya University

• SETO Osamu

  Department of Architecture and Building Engineering, Hokkai-Gakuen University

• Seto Osamu

  Department Of Architecture And Building Engineering Hokkai-gakuen University

• HABA Naoyuki

  Physik-Department, Technische Universitat Munchen

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