Same-Sign Charginos and Majorana Neutralinos at the LHC

TL;DR

This paper explores how weak boson fusion at the LHC can detect same-sign charginos, potentially confirming Majorana neutralinos and their couplings, with strategies to distinguish these signals from other new physics models.

Contribution

It introduces a novel method to study weakly interacting supersymmetric particles via weak boson fusion, highlighting the potential to confirm Majorana neutralinos at the LHC.

Findings

Same-sign chargino signals can be observed over QCD backgrounds.

Light charginos not near squark masses are optimal for detection.

Distinct signatures allow differentiation from other new physics models.

Abstract

We demonstrate the possibility of studying weakly interacting new particles in weak boson fusion, using the example of supersymmetric same-sign charginos. This signal could establish the existence of Majorana neutralinos and give access to their electroweak couplings. It can be observed over (supersymmetric) QCD backgrounds provided the charginos are light and not too close to the squark mass. We finally show how same-sign fermion production can be distinguished from same-sign scalars or vectors arising in other models of new physics.