Multi-scalar signature of self-interacting dark matter in the NMSSM and beyond

TL;DR

This paper investigates self-interacting dark matter within the NMSSM framework, providing analytical tools and Monte Carlo simulations to understand its signatures and behavior at the LHC.

Contribution

It introduces an improved analytical expression for SIDM cross sections considering Born effects and simulates DM/mediator production and decay at the LHC.

Findings

Analytical expression for SIDM cross section with Born effects

Monte Carlo simulation of DM/mediator showers at the LHC

Predicted multiplicities and spectra of DM/mediator from Higgsino decays

Abstract

This work studies the self-interacting dark matter (SIDM) scenario in the general NMSSM and beyond, where the dark matter is a Majorana fermion and the force mediator is a scalar boson. An improved analytical expression for the dark matter (DM) self-interacting cross section which takes into account the Born level effects is proposed. Due to the large couplings and light mediator in SIDM scenario, the DM/mediator will go through multiple branchings if they are produced with high energy. Based on the Monte Carlo simulation of the showers in the DM sector, we obtain the multiplicities and the spectra of the DM/mediator from the Higgsino production and decay at the LHC for our benchmark points.