Flavon assisted low scale leptogenesis
- 1Liaoning Normal University
Abstract
Low-scale leptogenesis scenarios, such as the resonant leptogenesis, typically require a highly degenerate mass spectrum of right-handed neutrinos (RHNs). This requirement can be circumvented by extending the seesaw framework with a scalar singlet S that couples to RHNs via the S NI NJ S N I N J terms (with I ≠ J I ≠ J ), which opens up new decay channels NI → NJ S N I → N J S and provides additional sources of CP violation, thereby enabling successful leptogenesis at the TeV scale without the need for mass degeneracy. In this work, for the first time, we point out that the flavon fields, which are introduced in many flavor-symmetry neutrino mass models to be responsible for the generation of RHN masses through the acquisition of non-zero vacuum expectation values, serve as ideal candidates for the S field. Taking as an example a flavor-symmetry neutrino mass model that naturally realizes the experimentally allowed TM1 mixing pattern and has the attractive features that only one flavon field plays the role of S and that it couples to only two RHNs, we demonstrate that the observed neutrino masses and mixing angles can be consistently reproduced, while the observed baryon asymmetry can be achieved within a parameter space compatible with current experimental constraints.
Related
- Purely flavon driven leptogenesis for exactly degenerate Dirac or Majorana neutrino mass matrix in the type-I seesaw model
- Decay-Assisted Leptogenesis during Preheating
- Primordial Black Hole Assisted Dirac Leptogenesis
- Testable neutrino mass and TeV-scale leptogenesis in a D4 inverse seesaw model
- Leptogenesis with a GeV-Scale Quasi-Dirac Neutrino
BibTeX
@article{shao2026flavon,
title = {{Flavon assisted low scale leptogenesis}},
author = {Yan Shao and Zhen-hua Zhao},
journal = {The European Physical Journal C},
year = {2026},
month = oct,
doi = {10.1140/epjc/s10052-026-16421-5},
url = {https://link.springer.com/article/10.1140/epjc/s10052-026-16421-5},
note = {CC BY 4.0},
}
RIS
TY - JOUR
TI - Flavon assisted low scale leptogenesis
AU - Yan Shao
AU - Zhen-hua Zhao
PY - 2026
DA - 2026/10/19
JO - The European Physical Journal C
DO - 10.1140/epjc/s10052-026-16421-5
UR - https://link.springer.com/article/10.1140/epjc/s10052-026-16421-5
AB - Low-scale leptogenesis scenarios, such as the resonant leptogenesis, typically require a highly degenerate mass spectrum of right-handed neutrinos (RHNs). This requirement can be circumvented by extending the seesaw framework with a scalar singlet S that couples to RHNs via the S N_I N_J S N I N J terms (with I ≠ J I ≠ J ), which opens up new decay channels N_I → N_J S N I → N J S and provides additional sources of CP violation, thereby enabling successful leptogenesis at the TeV scale without the need for mass degeneracy. In this work, for the first time, we point out that the flavon fields, which are introduced in many flavor-symmetry neutrino mass models to be responsible for the generation of RHN masses through the acquisition of non-zero vacuum expectation values, serve as ideal candidates for the S field. Taking as an example a flavor-symmetry neutrino mass model that naturally realizes the experimentally allowed TM1 mixing pattern and has the attractive features that only one flavon field plays the role of S and that it couples to only two RHNs, we demonstrate that the observed neutrino masses and mixing angles can be consistently reproduced, while the observed baryon asymmetry can be achieved within a parameter space compatible with current experimental constraints.
SN - 1434-6044
SN - 1434-6052
ER -