LZ nuclear recoil event from inelastic singlet-doublet scalar dark matter
- 1Department of Physics , Indian Institute of Technology Guwahati , Assam 781039 , India
Abstract
We study the possibility of explaining the recently reported high-energy nuclear recoil event by the LUX-ZEPLIN (LZ) collaboration within the framework of singlet-doublet scalar dark matter (DM). Considering DM to be the CP even mass eigenstate formed out of a scalar doublet and a real scalar singlet, both being odd under an unbroken Z2 symmetry, we find the parameter space of the model consistent with correct relic abundance and direct-detection limits on elastic scattering rates. A large part of the parameter space can also lead to inelastic up-scattering of DM with a rate and recoil energy consistent with the recent LZ event. Depending upon the singlet-doublet mixing, the model allows a much wider range of currently allowed parameter space compared to the pure scalar doublet DM limit, which is disfavored due to non-observations of high-energy neutrinos from solar-captured DM annihilation by the IceCube experiment. Presence of Z2-odd right-handed neutrinos also leads to other interesting phenomenology related to the origin of light neutrino masses and leptogenesis.
Related
- Inelastic Singlet-Doublet Fermion Dark Matter in light of the 248 keV LZ event
- Two-Component Dark Matter and Strongly First-Order Electroweak Phase Transition via a Two-Step Mechanism in the Inert Doublet plus Real Singlet Model
- Inelastic Dark Photon Dark Matter for the LUX-ZEPLIN High-Recoil Event and the Galactic Halo Gamma-Ray Excess
- Singlet-doublet dark matter induced radiative neutrino mass and TeV scale leptogenesis
- Solar Capture Tests of Inelastic Dark Matter after the LZ High-Recoil Event
BibTeX
@misc{bandyopadhyay2026nuclear,
title = {{LZ nuclear recoil event from inelastic singlet-doublet scalar dark matter}},
author = {Disha Bandyopadhyay and Debasish Borah and Pankaj Borah},
howpublished = {arXiv},
year = {2026},
month = sep,
doi = {10.48550/arxiv.2609.07451},
eprint = {2609.07451},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2609.07451},
}
RIS
TY - UNPB
TI - LZ nuclear recoil event from inelastic singlet-doublet scalar dark matter
AU - Disha Bandyopadhyay
AU - Debasish Borah
AU - Pankaj Borah
PY - 2026
DA - 2026/09/07
PB - arXiv
DO - 10.48550/arxiv.2609.07451
UR - https://arxiv.org/abs/2609.07451
AB - We study the possibility of explaining the recently reported high-energy nuclear recoil event by the LUX-ZEPLIN (LZ) collaboration within the framework of singlet-doublet scalar dark matter (DM). Considering DM to be the CP even mass eigenstate formed out of a scalar doublet and a real scalar singlet, both being odd under an unbroken Z_2 symmetry, we find the parameter space of the model consistent with correct relic abundance and direct-detection limits on elastic scattering rates. A large part of the parameter space can also lead to inelastic up-scattering of DM with a rate and recoil energy consistent with the recent LZ event. Depending upon the singlet-doublet mixing, the model allows a much wider range of currently allowed parameter space compared to the pure scalar doublet DM limit, which is disfavored due to non-observations of high-energy neutrinos from solar-captured DM annihilation by the IceCube experiment. Presence of Z_2-odd right-handed neutrinos also leads to other interesting phenomenology related to the origin of light neutrino masses and leptogenesis.
SN - 2331-8422
ER -