Singlet-doublet dark matter induced radiative neutrino mass and TeV scale leptogenesis
Abstract
The singlet-doublet dark matter (SDDM) model is a well-motivated WIMP framework that accommodates viable DM over a broad range of parameter space. In this work, we explore the possibility of TeV-scale leptogenesis within two realizations of the SDDM setup: Majorana SDDM scenario and Dirac SDDM scenario. The light neutrino mass, in either case, arises radiatively at one loop level. The particles running in the loop are responsible for DM relic and TeV-scale leptogenesis while satisfying other phenomenological constraints. In the Majorana setup, the Standard Model is extended by three generations of singlet fermions Ni and doublet fermions Ψi, and a singlet scalar ϕ. The CP-violating, out-of-equilibrium decays of the heavier singlets (N2,3) generate baryon asymmetry via the leptogenesis route, while the first generation of singlet-doublet fermions give rise to the usual SD Majorana DM. In the Dirac setup, the standard model is extended by three generations of complex scalars (ϕi) and right-handed Dirac partners (νRi) of SM neutrinos (νLi), along with a pair of singlet-doublet fermions χ and Ψ. The CP-violating out-of-equilibrium decays of the scalar fields ϕi generate baryon asymmetry via the Dirac leptogenesis route. We show that in the Majorana setup, successful leptogenesis is possible even in the sub-TeV regime, whereas in the Dirac setup, the leptogenesis scale is at a few TeV. With the particle mass at the TeV scale, the model remains promising for collider experiments, particularly through signatures such as prompt decays and displaced vertex searches. In addition, the presence of Dirac neutrinos can contribute to ΔNeff, providing complementary cosmological signatures.
Versions
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- Two-Component Dark Matter and Strongly First-Order Electroweak Phase Transition via a Two-Step Mechanism in the Inert Doublet plus Real Singlet Model
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BibTeX
@misc{paul2026singletdoublet,
title = {{Singlet-doublet dark matter induced radiative neutrino mass and TeV scale leptogenesis}},
author = {Partha Kumar Paul and Narendra Sahu and Shashwat Sharma},
howpublished = {arXiv},
year = {2026},
month = sep,
doi = {10.48550/arxiv.2605.04824},
eprint = {2605.04824},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2605.04824},
note = {CC BY 4.0},
}
RIS
TY - UNPB
TI - Singlet-doublet dark matter induced radiative neutrino mass and TeV scale leptogenesis
AU - Partha Kumar Paul
AU - Narendra Sahu
AU - Shashwat Sharma
PY - 2026
DA - 2026/09/28
PB - arXiv
DO - 10.48550/arxiv.2605.04824
UR - https://arxiv.org/abs/2605.04824
AB - The singlet-doublet dark matter (SDDM) model is a well-motivated WIMP framework that accommodates viable DM over a broad range of parameter space. In this work, we explore the possibility of TeV-scale leptogenesis within two realizations of the SDDM setup: Majorana SDDM scenario and Dirac SDDM scenario. The light neutrino mass, in either case, arises radiatively at one loop level. The particles running in the loop are responsible for DM relic and TeV-scale leptogenesis while satisfying other phenomenological constraints. In the Majorana setup, the Standard Model is extended by three generations of singlet fermions N_i and doublet fermions Ψ_i, and a singlet scalar ϕ. The CP-violating, out-of-equilibrium decays of the heavier singlets (N_2,3) generate baryon asymmetry via the leptogenesis route, while the first generation of singlet-doublet fermions give rise to the usual SD Majorana DM. In the Dirac setup, the standard model is extended by three generations of complex scalars (ϕ_i) and right-handed Dirac partners (ν_R_i) of SM neutrinos (ν_L_i), along with a pair of singlet-doublet fermions χ and Ψ. The CP-violating out-of-equilibrium decays of the scalar fields ϕ_i generate baryon asymmetry via the Dirac leptogenesis route. We show that in the Majorana setup, successful leptogenesis is possible even in the sub-TeV regime, whereas in the Dirac setup, the leptogenesis scale is at a few TeV. With the particle mass at the TeV scale, the model remains promising for collider experiments, particularly through signatures such as prompt decays and displaced vertex searches. In addition, the presence of Dirac neutrinos can contribute to ΔN_eff, providing complementary cosmological signatures.
ER -