Inelastic Dark Matter Signature at High Recoil Energy in LUX-ZEPLIN and CRESST
5 affiliations
- 1Institute for Astroparticle Physics (IAP) , Karlsruhe Institute of Technology (KIT) , Hermann-von-Helmholtz-Platz 1 , 76344 Eggenstein-Leopoldshafen , Germany
- 2Centre for Theoretical Physics , Henan Normal University , Xinxiang 453007 , P. R. China
- 3Institute of Theoretical Physics , Chinese Academy of Sciences , Beijing 100190 , P. R. China
- 4Department of Physics and
- 5Institute of Theoretical Physics , Nanjing Normal University , Nanjing , 210023 , P. R. China
Abstract
The LUX--ZEPLIN Collaboration recently reported one event at Enr=248±23 keV with an exposure of 2.84 tonne· yr. In this Letter, we interpret this feature using endothermic dark matter (DM). We consider both direct scattering of the surviving ground-state halo component and the contribution of excited states produced by terrestrial upscattering. Our calculations show that explaining the high-energy event requires mχ≳500 GeV and a mass splitting of 𝒪(300) keV, for which the production of excited states inside the Earth is kinematically forbidden. For σ̅n=10−37 cm2, an illustrative two-bin likelihood analysis yields a representative best-fit point at (mχ,δ)≃(1.105 TeV,350 keV). The preferred parameter region may be tested by the planned CRESST upgrade.
Related
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BibTeX
@misc{su2026inelastic,
title = {{Inelastic Dark Matter Signature at High Recoil Energy in LUX-ZEPLIN and CRESST}},
author = {Liangliang Su and Jin Min Yang and Wen-Na Yang},
howpublished = {arXiv},
year = {2026},
month = sep,
doi = {10.48550/arxiv.2609.01475},
eprint = {2609.01475},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2609.01475},
}
RIS
TY - UNPB
TI - Inelastic Dark Matter Signature at High Recoil Energy in LUX-ZEPLIN and CRESST
AU - Liangliang Su
AU - Jin Min Yang
AU - Wen-Na Yang
PY - 2026
DA - 2026/09/01
PB - arXiv
DO - 10.48550/arxiv.2609.01475
UR - https://arxiv.org/abs/2609.01475
AB - The LUX--ZEPLIN Collaboration recently reported one event at E_nr=248±23 keV with an exposure of 2.84 tonne· yr. In this Letter, we interpret this feature using endothermic dark matter (DM). We consider both direct scattering of the surviving ground-state halo component and the contribution of excited states produced by terrestrial upscattering. Our calculations show that explaining the high-energy event requires m_χ≳500 GeV and a mass splitting of 𝒪(300) keV, for which the production of excited states inside the Earth is kinematically forbidden. For σ̅_n=10^−37 cm^2, an illustrative two-bin likelihood analysis yields a representative best-fit point at (m_χ,δ)≃(1.105 TeV,350 keV). The preferred parameter region may be tested by the planned CRESST upgrade.
SN - 2331-8422
ER -