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arXiv · 2609.01590

TeV Higgsino Dark Matter from LZ Nuclear Recoil to Fermi-LAT Gamma Rays

Lei Wu·Yang Zhang·Bin Zhu
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Abstract

The excess of high-energy nuclear recoils, which was recently reported by the LUX-ZEPLIN (LZ) experiment, together with the Fermi-LAT Galactic-Center preference, suggests new physics beyond the standard model (SM). One of the minimal extensions of the SM is to introduce a fermionic electroweak doublet in which the lightest neutral component can play the role of a stable dark matter particle. We show that the minimal higgsino dark matter can offer a common origin for both excesses. The inferred mass splitting, however, depends on the local dark matter velocity distribution, and including the high-velocity tail generated by the gravitational influence of the Large Magellanic Cloud yields $δ_m =481$--$519~\mathrm{keV}$ for $m_χ=1000$--$1183~\mathrm{GeV}$ at $1σ$ level. Near elastic-scattering blind spots, solar-captured higgsinos fail to reach thermal equilibrium, weakening their annihilation signal, so that ten years of IceCube data exclude $δ_m \lesssim 475~\mathrm{keV}$ at 90% C.L. The viable parameter space can be tested through the associated gamma-ray line, which is within the projected reach of CTAO.

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Lei Wu, Yang Zhang, Bin Zhu. 2026-09-17. TeV Higgsino Dark Matter from LZ Nuclear Recoil to Fermi-LAT Gamma Rays. https://arxiv.org/abs/2609.01590

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