New Physics Interpretations with GAMBIT

TL;DR

This paper reports on GAMBIT's global fits to various beyond-the-Standard-Model theories, highlighting scenarios where collider constraints are evaded and potential data excesses favor light electroweakinos, with implications for supersymmetry.

Contribution

It provides the first comprehensive analysis of collider constraints on electroweakinos within the MSSM using GAMBIT, revealing scenarios that evade detection and possible hints of new physics.

Findings

Certain MSSM scenarios evade LHC constraints for any neutralino/chargino mass.

Data excesses suggest a preference for light neutralinos and charginos.

The local significance of the excess is 3.3 sigma with 13 TeV data.

Abstract

I present recent results from the Global and Modular Beyond-the-Standard-Model Inference Tool (GAMBIT) collaboration. Global fits with GAMBIT have been carried out on a variety of models including supersymmetric models, scalar singlet dark matter, fermionic and vector Higgs portal dark matter and axions. Here I focus on a recent GAMBIT study interpreting collider constraints on electroweakinos (arXiv:1809.02097). We show that when the neutralinos and charginos are the only light states of the MSSM, there are scenarios which evade LHC constraints for any mass of the lightest neutralino and the lightest chargino, i.e. the profile likelihood shows no constraint in this plane when one only considers the possibility of excluding new physics. Intriguingly, in addition we also find that excesses in the data can lead to closed confidence level contours, indicating a preference for light neutralinos and charginos over the Standard Model. We find the excess has a local significance of 3.3 sigma when combining ATLAS and CMS 13 TeV searches, but this drops to 2.9 sigma when including 8 TeV searches as well.