Exploring light supersymmetry with GAMBIT

TL;DR

This study uses GAMBIT to analyze collider data and finds that current LHC results do not strongly constrain light neutralino and chargino masses, with some data excesses potentially indicating new physics.

Contribution

The paper presents a comprehensive fit of collider constraints on the MSSM chargino and neutralino sector, revealing limited current constraints and possible signals of new physics.

Findings

Current LHC data do not impose strong constraints on light neutralino and chargino masses.

A pattern of excesses in some analyses can be fit within the model parameter space.

The excesses have a local significance of up to 3.3σ in the data.

Abstract

I summarize a recent study by the GAMBIT Collaboration in which we investigated the combined collider constraints on the chargino and neutralino sector of the Minimal Supersymmetric Standard Model. Through a large fit using GAMBIT we found that current ATLAS and CMS results with 36 fb$^{-1}$ of 13 TeV LHC collision data do not provide a general constraint on the lightest neutralino and chargino masses. Further, we found that a pattern of excesses in some of the LHC analyses can be fit in a subset of the model parameter space. The excess has an estimated local significance of 3.3$\sigma$ based on the 13 TeV results alone, and 2.9$\sigma$ when 13 TeV and 8 TeV results are combined.