# Confronting the neutralino and chargino sector of the NMSSM to the multi-lepton searches at the LHC

## TL;DR

This paper evaluates how current multi-lepton searches at the LHC constrain the NMSSM's chargino and neutralino sectors, highlighting effects beyond the MSSM that influence search effectiveness and proposing new search considerations.

## Contribution

It provides a detailed collider analysis of NMSSM electroweakinos, emphasizing the impact of singlino and Higgs-singlet states on search strategies and constraints.

## Key findings

- Singlino and Higgs-singlet states can produce softer or less identifiable SM particles.
- Compressed spectra with singlino NLSP can lead to photon-rich final states.
- Current searches may miss certain NMSSM scenarios due to altered decay chains.

## Abstract

We test the impact of the ATLAS and CMS multi-lepton searches performed at the LHC with 8 as well as 13 TeV center-of-mass energy (using only the pre-2018 results) on the chargino and neutralino sector of the NMSSM. Our purpose consists in analyzing the actual reach of these searches for a full model and in emphasizing effects beyond the MSSM that affect the performance of current (MSSM-inspired) electroweakino searches. To this end, we consider several scenarios characterizing specific features of the NMSSM electroweakino sector. We then perform a detailed collider study, generating Monte-Carlo events through Pythia and testing against current LHC constraints implemented in the public tool CheckMATE. We find e.g. that SUSY decay chains involving intermediate singlino or Higgs-singlet states can modify the naive MSSM-like picture of the constraints by inducing final-states with softer or less-easily identifiable SM particles -- reversely, a compressed configuration with singlino NLSP occasionally induces final states that are rich with photons, which could provide complementary search channels.