Explaining the LZ High-Energy Recoil Event with Inelastic Sneutrino Dark Matter in Supersymmetry

Abstract

We study an inelastic sneutrino dark matter origin of the LZ high-energy event in the inverse-seesaw next-to-minimal supersymmetric standard model. Approximate lepton-number conservation protects the small mass splitting, while singlet interactions separate freeze-out from solar-neutrino production. The LZ recoil and solar constraints overlap even for a fully cooled population in equilibrium. Three thermal mechanisms reproduce the relic abundance and satisfy all relevant constraints. Photon-dominated annihilation produces gamma-ray boxes, offering a complementary test of this interpretation.

arXiv comment18 pages, 4 figures