Comparison of neutralino and sneutrino dark matter in a model with spontaneous CP violation

TL;DR

This paper investigates how spontaneous CP violation in a supersymmetric model affects dark matter candidates, specifically neutralinos and right-handed sneutrinos, and explores their relic densities and collider phenomenology.

Contribution

It introduces the analysis of scalar and neutralino dark matter with spontaneous CP violation within a specific supersymmetric framework, highlighting new annihilation channels and their impact on relic density.

Findings

Both neutralino and right-handed sneutrino can account for observed relic density.

Spontaneous CP violation introduces new annihilation channels that reduce relic density.

Benchmark scenarios satisfy experimental constraints with either candidate as dominant dark matter component.

Abstract

Supersymmetric extensions to the standard model provide viable dark matter candidates, and can introduce additional charge-parity (CP) violation, needed for obtaining the observed baryon asymmetry of the universe. We study the possibilities of scalar and neutralino dark matter with spontaneous CP violation in the next-to-minimal supersymmetric standard model with a right handed neutrino. The observed relic density can be produced both by neutralino and right handed sneutrino as the lightest supersymmetric particle, but when CP is violated, the new annihilation channels lower the achieved relic density in general. We consider collider phenomenology in a number of benchmark points, in which all experimental constraints are satisfied, and either the neutralino or the right handed sneutrino contribute to the dark matter abundance.