A scalar-extended U(1) L mu-L tau explanation of the LUX-ZEPLIN 248 keV excess
The paper proposes extending a U(1)Lµ-Lτ model with two complex scalar fields, $\Phi$ and $S$, to explain a 248 keV dark matter nuclear recoil event at LZ. This extension introduces a trilinear interaction that generates the necessary mass splitting between DM particles, leading to an inelastic scattering scenario that matches the observed excess.