Not so good $\nu$s for Higgsino dark matter as LZ excess: stringent limits from Super-Kamiokande and IceCube

Debajit Bose; Akash Kumar Saha; Deep Jyoti Das; Rinchen Sherpa; Abhijeet Singh; Durba Ghosh; Jaya Doliya; Subhadip Bouri; Biprajit Mondal; Ranjini Mondol; Nirmal Raj; Ranjan Laha

arXiv · 2609.07807

Not so good $\nu$s for Higgsino dark matter as LZ excess: stringent limits from Super-Kamiokande and IceCube

Debajit Bose·Akash Kumar Saha·Deep Jyoti Das·Rinchen Sherpa·Abhijeet Singh·Durba Ghosh·Jaya Doliya·Subhadip Bouri·Biprajit Mondal·Ranjini Mondol·Nirmal Raj·Ranjan Laha

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Abstract

The LUX-ZEPLIN (LZ) collaboration has recently reported a single nuclear recoil event at a high recoil energy of about 250 keV. This has been interpreted as inelastic scattering of dark matter that is a supersymmetric Higgsino with a mass splitting between the neutral states of a few 100 keV. Such dark matter may be captured at high recoil in the Sun through scattering on heavy elements in it, and annihilate to $W^+W^-$ and $ZZ$, in turn giving rise to a neutrino flux detectable on Earth. Using measurements of atmospheric electron- and muon-neutrino fluxes by Super-Kamiokande and IceCube, we constrain thermal and non-thermal Higgsino dark matter, excluding inter-state mass splittings $\lesssim 557$ keV. This disfavors Higgsino-like interpretations of the LZ event for standard halo velocities.

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Debajit Bose, Akash Kumar Saha, Deep Jyoti Das, Rinchen Sherpa, Abhijeet Singh, Durba Ghosh, Jaya Doliya, Subhadip Bouri, Biprajit Mondal, Ranjini Mondol, Nirmal Raj, Ranjan Laha. 2026-09-07. Not so good $\nu$s for Higgsino dark matter as LZ excess: stringent limits from Super-Kamiokande and IceCube. https://arxiv.org/abs/2609.07807

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