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Peer-reviewedCC BY 4.0Journal of High Energy Physics

Leptogenesis without on-shell right-handed neutrinos

  • Simon Cléry1
  • Alejandro Ibarra1
  • Onur Yonar1
  1. 1TUM School of Natural Sciences, Technical University of Munich
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Abstract

A bstract : We propose a novel mechanism for generating the baryon asymmetry of the Universe through leptogenesis in a scenario where the right-handed neutrinos are heavier than the maximal temperature of the Universe, and are never produced on-shell, neither by thermal nor by non-thermal mechanisms. We introduce a new scalar field, ϕ , lighter than the right-handed neutrinos, that couples to the latter via a Yukawa coupling, so that it decays into two lepton doublets and two higgs doublets via off-shell right-handed neutrinos. Then, we derive the CP asymmetry arising from the interference between tree-level and loop diagrams in the four-body decay, and we show that the generated baryon asymmetry can reproduce the observed value both in a scenario where ϕ is responsible for the reheating of the Universe, and in a scenario where ϕ is a generic scalar that remains in thermal equilibrium with the plasma.

Versions

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Cite

BibTeXRIS
BibTeX
@article{clery2026leptogenesis,
  title = {{Leptogenesis without on-shell right-handed neutrinos}},
  author = {Simon Cléry and Alejandro Ibarra and Onur Yonar},
  journal = {Journal of High Energy Physics},
  year = {2026},
  month = oct,
  doi = {10.1007/jhep10(2026)038},
  url = {https://link.springer.com/10.1007/JHEP10(2026)038},
  note = {CC BY 4.0},
}
RIS
TY  - JOUR
TI  - Leptogenesis without on-shell right-handed neutrinos
AU  - Simon Cléry
AU  - Alejandro Ibarra
AU  - Onur Yonar
PY  - 2026
DA  - 2026/10/02
JO  - Journal of High Energy Physics
DO  - 10.1007/jhep10(2026)038
UR  - https://link.springer.com/10.1007/JHEP10(2026)038
AB  - A bstract : We propose a novel mechanism for generating the baryon asymmetry of the Universe through leptogenesis in a scenario where the right-handed neutrinos are heavier than the maximal temperature of the Universe, and are never produced on-shell, neither by thermal nor by non-thermal mechanisms. We introduce a new scalar field, ϕ , lighter than the right-handed neutrinos, that couples to the latter via a Yukawa coupling, so that it decays into two lepton doublets and two higgs doublets via off-shell right-handed neutrinos. Then, we derive the CP asymmetry arising from the interference between tree-level and loop diagrams in the four-body decay, and we show that the generated baryon asymmetry can reproduce the observed value both in a scenario where ϕ is responsible for the reheating of the Universe, and in a scenario where ϕ is a generic scalar that remains in thermal equilibrium with the plasma.
SN  - 1029-8479
ER  -