A new study proposes that the Higgsino, a supersymmetric particle, could be responsible for anomalies observed in the LZ and Fermi-LAT experiments, which search for dark matter signals. This interpretation suggests that the Higgsino, a WIMP (Weakly Interacting Massive Particle) candidate from the Minimal Supersymmetric Standard Model, would have a mass of approximately 1.1 TeV. This mass value is derived from the relic abundance of dark matter in the universe, while the nuclear recoil spectrum observed by LZ points to a mass splitting of a few hundred keV.

The LZ experiment, an underground liquid xenon detector, has reported an excess of nuclear recoil events that cannot be explained by known backgrounds. Simultaneously, 14 years of data from the Fermi-LAT space telescope show a mild preference for a gamma-ray signal in the Galactic center, consistent with the annihilation of dark matter particles. The 1.1 TeV Higgsino hypothesis successfully reconciles both results, providing a unified explanation for these seemingly disparate observations.

In addition to explaining the LZ and Fermi-LAT anomalies, this Higgsino interpretation is also consistent with solar neutrino constraints imposed by the IceCube experiment over 10 years. The model predicts the existence of a gamma-ray line and an endpoint signal in the Galactic center, which are near the current sensitivity of the H.E.S.S. observatory and within the projected reach of the future Cherenkov Telescope Array Observatory (CTAO). This means that this classic dark matter hypothesis could be experimentally tested in the near future, opening a window for the direct detection of these elusive particles.