Long live The NMSSM!

TL;DR

This paper explores the NMSSM with a singlino-like LSP, identifying regions with long-lived electroweakinos that produce displaced vertices, and proposes track-based analysis methods to detect these at the HL-LHC.

Contribution

It classifies parameter space regions with long-lived NLSPs in the NMSSM and develops specialized analysis strategies for their detection at the HL-LHC.

Findings

Viable long-lived electroweakino scenarios identified.

Displaced vertex signatures can be effectively detected at HL-LHC.

Focused searches extend discovery reach for challenging electroweakino regions.

Abstract

We analyze the scenario within the Next to Minimal Supersymmetric Standard Model (NMSSM), where the lightest supersymmetric particle (LSP) is singlino-like neutralino. By systematically considering various possible admixtures in the electroweakino sector, we classify regions of parameter space where the next to lightest supersymmetric particle (NLSP) is a long-lived electroweakino while remaining consistent with constraints from flavor physics, dark matter direct detection, and collider data. We identify viable cascade decay modes featuring the long-lived NLSP for directly produced chargino-neutralino pairs, thus, leading to displaced vertex signatures at the high luminosity LHC (HL-LHC). We construct track based analysis in order to uncover such scenarios at the HL-LHC and analyze their discovery potential. We show that through such focused searches for the long-lived particles at the HL-LHC, one can probe regions of the electroweakino parameter space that are otherwise challenging.