Constraining Electroweakinos in the Minimal Dirac Gaugino Model

TL;DR

This paper explores the electroweakino sector of the Minimal Dirac Gaugino Supersymmetric Standard Model, analyzing dark matter viability and collider constraints, highlighting unique phenomenology with longer-lived particles and richer spectra.

Contribution

It provides the first detailed analysis of the electroweakino sector in the MDGSSM, including dark matter compatibility, collider phenomenology, and reinterpretation of LHC search sensitivities.

Findings

Viable dark matter candidates identified within the parameter space.

Richer electroweakino spectrum with longer-lived particles compared to MSSM.

Certain scenarios remain unconstrained by current LHC searches.

Abstract

Supersymmetric models with Dirac instead of Majorana gaugino masses have distinct phenomenological consequences. In this paper, we investigate the electroweakino sector of the Minimal Dirac Gaugino Supersymmetric Standard Model (MDGSSM) with regards to dark matter (DM) and collider constraints. We delineate the parameter space where the lightest neutralino of the MDGSSM is a viable DM candidate, that makes for at least part of the observed relic abundance while evading constraints from DM direct detection, LEP and lowenergy data, and LHC Higgs measurements. The collider phenomenology of the thus emerging scenarios is characterised by the richer electroweakino spectrum as compared to the Minimal Supersymmetric Standard Model (MSSM) -- 6 neutralinos and 3 charginos instead of 4 and 2 in the MSSM, naturally small mass splittings, and the frequent presence of long-lived particles, both charginos and/or neutralinos. Reinterpreting ATLAS and CMS analyses with the help of SModelS and MadAnalysis 5, we discuss the sensitivity of existing LHC searches for new physics to these scenarios and show which cases can be constrained and which escape detection. Finally, we propose a set of benchmark points which can be useful for further studies, designing dedicated experimental analyses and/or investigating the potential of future experiments.