Two-component scalar dark matter in Z2n scenarios

Abstract

Abstract In multi-component scalar dark matter scenarios, a single ZN (N ≥ 4) symmetry may account for the stability of different dark matter particles. Here we study the case where N is even (N = 2n) and two species, a complex scalar and a real scalar, contribute to the observed dark matter density. We perform a phenomenological analysis of three scenarios based on the Z4 and Z6 symmetries, characterizing their viable parameter spaces and analyzing their detection prospects. Our results show that, thanks to the new interactions allowed by the Z2n symmetry, current experimental constraints can be satisfied over a wider range of dark matter masses, and that these scenarios may lead to observable signals in direct detection experiments. Finally, we argue that these three scenarios serve as prototypes for other two-component Z2n models with one complex and one real dark matter particle.