Reweighting with Boosted Decision Trees

TL;DR

This paper introduces a new reweighting method using boosted decision trees to improve the agreement between simulated and observed data in high energy physics analyses.

Contribution

The paper proposes a novel event reweighting technique based on boosted decision trees, enhancing data correction in HEP simulations.

Findings

Improved reweighting accuracy demonstrated.

Method effectively reduces simulation-observation discrepancies.

Applicable to various HEP analysis scenarios.

Abstract

Machine learning tools are commonly used in modern high energy physics (HEP) experiments. Different models, such as boosted decision trees (BDT) and artificial neural networks (ANN), are widely used in analyses and even in the software triggers. In most cases, these are classification models used to select the "signal" events from data. Monte Carlo simulated events typically take part in training of these models. While the results of the simulation are expected to be close to real data, in practical cases there is notable disagreement between simulated and observed data. In order to use available simulation in training, corrections must be introduced to generated data. One common approach is reweighting - assigning weights to the simulated events. We present a novel method of event reweighting based on boosted decision trees. The problem of checking the quality of reweighting step in analyses is also discussed.