Journal
PROGRESS OF THEORETICAL PHYSICS
Volume 125, Issue 6, Pages 1155-1169Publisher
PROGRESS THEORETICAL PHYSICS PUBLICATION OFFICE
DOI: 10.1143/PTP.125.1155
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Funding
- Ministry of Education, Culture, Sports, Science and Technology of Japan [20540272, 22011005, 20039006, 20025004]
- Hokkai-Gakuen
- Grants-in-Aid for Scientific Research [22011005, 20540272, 20244028] Funding Source: KAKEN
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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.
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