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arXiv · 2609.04144

Inelastic Signatures of Electroweak Dark Matter

Juri Smirnov·Spencer Griffith·John F. Beacom
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Abstract

Minimal dark matter extended to include a Majorana and a Dirac multiplet coupled through the Higgs --- the HC-MDM model --- provides a compelling and predictive framework. We show that in certain limits of this model, the mass splitting and the inelastic interaction are representation-independent, while the thermal-relic masses are representation-dependent. We then show that this model can account for the high-energy recoil event recently reported by LUX-ZEPLIN (LZ) while also respecting thermal-relic, elastic-scattering, and solar-capture constraints. Generic inelastic DM models do not connect all these tests and generic Higgsino models do not survive them.

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Juri Smirnov, Spencer Griffith, John F. Beacom. 2026-09-03. Inelastic Signatures of Electroweak Dark Matter. https://arxiv.org/abs/2609.04144

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