Leptogenesis in type Ib seesaw models
Leptogenesis in type Ib seesaw models
We study leptogenesis in three different realizations of the type Ib seesaw mechanism, where the effective masses of the neutrinos are obtained by the spontaneous symmetry breaking of two different Higgs doublets. In the minimal type Ib seesaw model, where two right-handed neutrinos form a Dirac mass, we show that it is impossible to produce the correct baryon asymmetry, even including a pseudo-Dirac mass splitting. In an extended type Ib seesaw model, with a third very heavy Majorana right-handed neutrino, together with the low-scale Dirac pair of right-handed (RH) neutrinos and an extra singlet Higgs boson, we find that the imbalance of matter and antimatter can be explained by resonant leptogenesis. In the resulting low-scale effective type Ib seesaw mechanism, we derive the allowed range of the seesaw couplings consistent with resonant leptogenesis. Dark matter may also be included via the right-handed neutrino portal. The Dirac RH neutrino masses may lie in the 1-100-GeV mass range, accessible to the future experiments Search for Hidden Particles (SHiP) and Future electron-positron Circular Collider (FCC-ee), allowing the type Ib seesaw mechanism with leptogenesis and dark matter to be tested.
Fu, Bowen
71c18b27-d30a-4e33-806b-e45ea5446e46
King, Stephen F.
f8c616b7-0336-4046-a943-700af83a1538
2 May 2022
Fu, Bowen
71c18b27-d30a-4e33-806b-e45ea5446e46
King, Stephen F.
f8c616b7-0336-4046-a943-700af83a1538
Abstract
We study leptogenesis in three different realizations of the type Ib seesaw mechanism, where the effective masses of the neutrinos are obtained by the spontaneous symmetry breaking of two different Higgs doublets. In the minimal type Ib seesaw model, where two right-handed neutrinos form a Dirac mass, we show that it is impossible to produce the correct baryon asymmetry, even including a pseudo-Dirac mass splitting. In an extended type Ib seesaw model, with a third very heavy Majorana right-handed neutrino, together with the low-scale Dirac pair of right-handed (RH) neutrinos and an extra singlet Higgs boson, we find that the imbalance of matter and antimatter can be explained by resonant leptogenesis. In the resulting low-scale effective type Ib seesaw mechanism, we derive the allowed range of the seesaw couplings consistent with resonant leptogenesis. Dark matter may also be included via the right-handed neutrino portal. The Dirac RH neutrino masses may lie in the 1-100-GeV mass range, accessible to the future experiments Search for Hidden Particles (SHiP) and Future electron-positron Circular Collider (FCC-ee), allowing the type Ib seesaw mechanism with leptogenesis and dark matter to be tested.
Text
PhysRevD.105.095001
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Accepted/In Press date: 30 March 2022
Published date: 2 May 2022
Additional Information:
Funding Information:
B. F. acknowledges the Chinese Scholarship Council (CSC) Grant No. 201809210011 under agreements [2018]3101 and [2019]536. S. F. K. acknowledges the STFC Consolidated Grant No. ST/L000296/1 and the European Union’s Horizon 2020 Research and Innovation programme under Marie Sklodowska-Curie grant agreement HIDDeN European ITN project (Grant No. H2020-MSCA-ITN-2019//860881-HIDDeN). The authors thank Marco Chianese for useful discussions.
Publisher Copyright:
© 2022 authors.
Identifiers
Local EPrints ID: 457353
URI: http://eprints.soton.ac.uk/id/eprint/457353
ISSN: 1550-7998
PURE UUID: ddcb7b20-2c96-4293-b098-387b655a2a2d
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Date deposited: 01 Jun 2022 16:45
Last modified: 16 Mar 2024 17:25
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