A recent high-recoil event reported by the LUX-ZEPLIN (LZ) experiment has motivated a new theoretical interpretation within the framework of supersymmetry. This event, featuring a significant recoil, could be explained by the interaction of a Higgsino with a mass on the order of a TeV, characterized by a sub-MeV energy splitting between its neutral states. In the Minimal Supersymmetric Standard Model (MSSM), such a small gap in the Higgsino's neutral states, absent specific cancellations, typically implies electroweak gaugino masses on the order of $10^7$ GeV, a value much higher than the Higgsino's own mass.

Researchers have proposed that a non-universal boundary condition for gaugino masses ($M_1^G/M_2^G = -3/5$) at the SU(5) Grand Unified Theory (GUT) scale could resolve this discrepancy. This condition would allow for the cancellation of leading bino and wino contributions and would be preserved under homogeneous one-loop evolution down to the Higgsino scale. This opens the possibility for a controlled tree-level solution with a wino mass near 120 TeV for a 350 keV gap, a 1.091 TeV Higgsino, and $\tan\beta = 10$. Mixed SU(5) representations that realize the required gaugino ratio have been identified.

It is crucial to note that, despite this new interpretation, a full-density thermal Higgsino remains subject to published solar-capture bounds. This is because the inelastic Z coupling remains essentially unsuppressed, implying that the astrophysical and transport assumptions used in solar-capture limits are still valid for this scenario. The radiative sensitivity and spectrum consistency of this theoretical construction have been examined to ensure its viability.