The past, present and future of the heavier electroweakinos in the light of LHC and other data

TL;DR

This paper investigates novel multilepton signals from heavier electroweakinos at the LHC, providing new constraints, exploring future detection prospects, and discussing implications for dark matter and muon magnetic moment.

Contribution

It introduces the first constraints on multilepton signals from heavier electroweakinos using LHC Run II data and explores their potential as discovery channels in future experiments.

Findings

New constraints on heavier electroweakinos from LHC Run II data.

Identification of benchmark points for future multilepton searches.

Implications for dark matter relic density and muon magnetic moment.

Abstract

The aim of this paper is to showcase the novel multilepton ($nl + E\!\!\!\!/_T$, n = 3 - 5) signals, hitherto unexplored at the LHC, arising from the heavier electroweakinos, in several generic pMSSMs at the upcoming LHC experiments. We first briefly review our old constraints on the full electroweakino sector of these models, containing both lighter and heavier sparticles, using the ATLAS trilepton data from the LHC Run I. Next we derive new stronger constraints on this sector for the first time using the ATLAS Run II data. We identify some benchmark points and explore the prospect of observing multilepton events in future LHC experiments. Our focus is on the channels with $n > 3$ which are the hallmarks of the heavier electroweakinos. If the spectrum of the lighter electroweakinos is compressed, these signals might very well be the discovery channels of the electroweakinos at the high luminosity LHC. We also discuss the implications of the new LHC constraints for the observed dark matter relic density of the universe, the measured value of the anomalous magnetic moment of the muon and the dark matter direct detection experiments.