Strong Constraints on Higgsino Dark Matter from Solar Capture
Abstract
Higgsino dark matter remains one of the most convincing dark matter candidates. It can exist in a ``quasi-Dirac" regime, when the splitting between two Majorana components is on the order of O(few MeV) or less. Owing to the strong gravitational pull of the Sun, the DM particles accelerate to up to ∼ 1400\,km/sec in the solar core, which allows for inelastic scattering on heavy elements and very effective capture onto solar-bound trajectories. We evaluate the expected flux of the neutrinos from the expected χχ→ W+W-,ZZ annihilation for the cosmologically preferred mass, mχ≃ 1.08\,TeV while keeping the mass splitting δ as a free parameter. Confronting it with the non-observation of high-energy neutrinos from the Sun by the IceCube experiment, we obtain a robust limit, δ>566\,keV. These limits exclude the interpretation of the recent LZ event in terms of endothermic inelastic scattering of Higgsino dark matter on xenon nuclei.
Related
- Higgsino dark matter compatible with the LUX-ZEPLIN high-energy nuclear-recoil event and IceCube constraints
- Constraints on Complex Electroweak WIMPs from Solar Capture
- Enhancing Constraints on Ultralight Axion Dark Matter from Gravitational Capture
- Solar Capture Tests of Inelastic Dark Matter after the LZ High-Recoil Event
- Solar Neutrino Constraints on Inelastic Dark Matter Scattering in Light of Recent LUX-ZEPLIN Observations
BibTeX
@misc{pospelov2026strong,
title = {{Strong Constraints on Higgsino Dark Matter from Solar Capture}},
author = {Maxim Pospelov and Harikrishnan Ramani},
howpublished = {arXiv},
year = {2026},
month = sep,
doi = {10.48550/arxiv.2609.02775},
eprint = {2609.02775},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2609.02775},
note = {CC BY 4.0},
}
RIS
TY - UNPB
TI - Strong Constraints on Higgsino Dark Matter from Solar Capture
AU - Maxim Pospelov
AU - Harikrishnan Ramani
PY - 2026
DA - 2026/09/02
PB - arXiv
DO - 10.48550/arxiv.2609.02775
UR - https://arxiv.org/abs/2609.02775
AB - Higgsino dark matter remains one of the most convincing dark matter candidates. It can exist in a ``quasi-Dirac" regime, when the splitting between two Majorana components is on the order of O(few MeV) or less. Owing to the strong gravitational pull of the Sun, the DM particles accelerate to up to ∼ 1400\,km/sec in the solar core, which allows for inelastic scattering on heavy elements and very effective capture onto solar-bound trajectories. We evaluate the expected flux of the neutrinos from the expected χχ→ W^+W^-,ZZ annihilation for the cosmologically preferred mass, m_χ≃ 1.08\,TeV while keeping the mass splitting δ as a free parameter. Confronting it with the non-observation of high-energy neutrinos from the Sun by the IceCube experiment, we obtain a robust limit, δ>566\,keV. These limits exclude the interpretation of the recent LZ event in terms of endothermic inelastic scattering of Higgsino dark matter on xenon nuclei.
ER -