# Class Imbalance Techniques for High Energy Physics

## TL;DR

This paper reviews class imbalance techniques in high energy physics, illustrating their application through two case studies involving signal extraction in particle decay and scattering experiments.

## Contribution

It provides an overview of class imbalance methods tailored for high energy physics and demonstrates their practical use in two specific experimental analyses.

## Key findings

- Effective class imbalance techniques improve signal detection.
- Application of methods enhances measurement accuracy in physics experiments.
- Case studies validate the utility of imbalance techniques in real-world scenarios.

## Abstract

A common problem in a high energy physics experiment is extracting a signal from a much larger background. Posed as a classification task, there is said to be an imbalance in the number of samples belonging to the signal class versus the number of samples from the background class. In this work we provide a brief overview of class imbalance techniques in a high energy physics setting. Two case studies are presented: (1) the measurement of the longitudinal polarization fraction in same-sign $WW$ scattering, and (2) the decay of the Higgs boson to charm-quark pairs.