Loop-induced photon spectral lines from neutralino annihilation in the NMSSM

TL;DR

This paper calculates the loop-induced monochromatic photon signals from neutralino annihilation in the NMSSM, providing new insights into potential dark matter detection signatures and comparing them with MSSM predictions.

Contribution

First computation of neutralino annihilation into photon and Z boson in the NMSSM using automated one-loop methods, with analysis of signal enhancement and experimental constraints.

Findings

Photon signals can be significantly enhanced in the NMSSM compared to MSSM.

The study identifies parameter regions where the gamma-ray signals are detectable.

Constraints from FERMI data limit certain NMSSM parameter spaces.

Abstract

We have computed the loop-induced processes of neutralino annihilation into two photons and, for the first time, into a photon and a Z boson in the framework of the NMSSM. The photons produced from these radiative modes are monochromatic and possess a clear "smoking gun" experimental signature. This numerical analysis has been done with the help of the SloopS code, initially developed for automatic one-loop calculation in the MSSM. We have computed the rates for different benchmark points coming from SUGRA and GMSB soft SUSY breaking scenarios and compared them with the MSSM. We comment on how this signal can be enhanced, with respect to the MSSM, especially in the low mass region of the neutralino. We also discuss the possibility of this observable to constrain the NMSSM parameter space, taking into account the latest limits from the FERMI collaboration on these two modes.