`Stop' that ambulance! New physics at the LHC?

TL;DR

This paper proposes a supersymmetric model with light stop, winos, and binos to explain excesses observed in LHC measurements, achieving a statistically significant fit improvement over the Standard Model.

Contribution

The authors introduce a specific supersymmetric model that can simultaneously account for multiple LHC excesses, providing a better fit than the Standard Model.

Findings

Model fits LHC excesses with 3.5-sigma significance.

Reduces log-likelihood by 15.4 compared to Standard Model.

Consistent with observed W+W- and leptonic final state excesses.

Abstract

A number of LHC searches now display intriguing excesses. Most prominently, the measurement of the $W^+W^-$ cross-section has been consistently $\sim 20\%$ higher than the theoretical prediction across both ATLAS and CMS for both 7 and 8 TeV runs. More recently, supersymmetric searches for final states containing two or three leptons have also seen more events than predicted in certain signal regions. We show that a supersymmetric model containing a light stop, winos and binos can consistently match the data. We perform a fit to all measurements and searches that may be sensitive to our model and find a reduction in the log-likelihood of 15.4 compared to the Standard Model which corresponds to 3.5-$\sigma$ once the extra degrees of freedom in the fit are considered.