Gamma-ray lines constraints in the NMSSM

TL;DR

This paper calculates the loop-induced gamma-ray line signals from dark matter annihilation in the NMSSM, highlighting potential enhancements over the MSSM and comparing with FERMI-LAT observational limits.

Contribution

It provides the first detailed computation of gamma-ray line signals in the NMSSM using the SloopS code, focusing on a light neutralino scenario.

Findings

Potential signal enhancement in NMSSM compared to MSSM

Comparison with FERMI-LAT limits shows parameter space constraints

Loop-induced gamma-ray lines are a promising but challenging detection channel

Abstract

We present the computation of the loop-induced self-annihilation of dark matter particles into two photons in the framework of the NMSSM. This process is a theoretically clean observable with a "smoking-gun" signature but is experimentally very challenging to detect. The rates were computed with the help of the SloopS program, an automatic code initially designed for the evaluation of processes at the one-loop level in the MSSM. We focused on a light neutralino scenario and discuss how the signal can be enhanced in the NMSSM with respect to the MSSM and then compared with the present limits given by the dedicated search of the FERMI-LAT satellite on the monochromatic gamma lines.