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This paper proposes that Higgsino dark matter, a theoretical particle predicted by supersymmetry, could explain an unusual 248 keV nuclear-recoil event observed by the LUX-ZEPLIN dark matter detector. The researchers show that a Higgsino with a mass around 1 TeV and a specific mass splitting of approximately 350 keV between two nearly identical states would produce a scattering signal consistent with the observed event through inelastic interactions with atomic nuclei. Unlike other dark matter models, the Higgsino scenario uniquely predicts the interaction strength from fundamental electroweak theory rather than treating it as an adjustable parameter.
Why it matters
If confirmed, this interpretation could provide the first direct detection of dark matter and validate supersymmetric theories that extend the Standard Model of particle physics. The specific prediction of interaction rates from theory makes this hypothesis testable by ongoing and future dark matter detection experiments.
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⚠️ Preprint – Noch nicht peer-reviewed
Dieser Artikel wurde noch nicht von unabhängigen Experten begutachtet. Die Ergebnisse sind vorläufig und sollten mit Vorsicht interpretiert werden.
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Abstract: We propose Higgsino dark matter as a potential interpretation of the $248~mathrm{keV}$ nuclear-recoil event of interest reported by the LUX-ZEPLIN (LZ) experiment. LZ studied several rare background processes and detector effects in detail, but did not identify any as a likely explanation of the event. A nearly pure Higgsino naturally realizes inelastic dark matter through the off-diagonal $Z$ coupling of two nearly degenerate neutral Majorana states separated by a mass splitting $delta$. The same electroweak interaction fixes the inelastic Higgsino-nucleon scattering cross section, rather than leaving it as a free parameter. We show that the predicted Higgsino inelastic scattering cross section approaches the published LZ two-sided 90% confidence interval for a Higgsino mass $m_{widetilde H}sim1~mathrm{TeV}$ and a mass splitting $deltasim350~mathrm{keV}$.
Source: Higgsino Dark Matter Interpretation of the LUX-ZEPLIN 248 keV Nuclear-Recoil Event