# Tagging new physics with charm

## TL;DR

The paper introduces the charm fraction, a new variable for collider searches, which enhances the detection and discrimination of supersymmetry models involving squarks and gluinos at the LHC.

## Contribution

It proposes the charm fraction as a novel variable that improves sensitivity and model discrimination in supersymmetry searches at high-energy colliders.

## Key findings

- Charm fraction increases search sensitivity for heavy gluinos.
- Charm tagging improves model discrimination.
- Potential to estimate gluino mass with charm fraction.

## Abstract

We propose a new variable, the charm fraction, for collider searches for new physics. We analyze this variable in the context of searches for simplified supersymmetry models with squarks, the gluino, and the bino, assuming that only the lightest mass-degenerate squarks can be produced at the high-luminosity LHC. The charm fraction complements event counting and kinematic information, increasing the sensitivity of the searches for models with heavy gluinos, for which squark production is flavor-blind. If squarks are discovered at the LHC, this variable can help discriminate between different underlying models. In particular, with improved charm tagging, the charm fraction can provide information on the gluino mass, and in some scenarios, on whether this mass is within the reach of a future 100 TeV hadron collider.