SR-GAN for SR-gamma: super resolution of photon calorimeter images at collider experiments

TL;DR

This paper applies GAN-based super-resolution to electromagnetic calorimeter images in collider experiments, enhancing image resolution to improve feature reconstruction and photon identification, especially with limited training data.

Contribution

It introduces a super-resolution method using GANs for calorimeter images, improving feature extraction and photon identification in collider data.

Findings

Enhanced reconstruction of shower-shape variables.

Improved photon identification with limited training data.

Super-resolution images retain key shower features.

Abstract

We study single-image super-resolution algorithms for photons at collider experiments based on generative adversarial networks. We treat the energy depositions of simulated electromagnetic showers of photons and neutral-pion decays in a toy electromagnetic calorimeter as 2D images and we train super-resolution networks to generate images with an artificially increased resolution by a factor of four in each dimension. The generated images are able to reproduce features of the electromagnetic showers that are not obvious from the images at nominal resolution. Using the artificially-enhanced images for the reconstruction of shower-shape variables and of the position of the shower center results in significant improvements. We additionally investigate the utilization of the generated images as a pre-processing step for deep-learning photon-identification algorithms and observe improvements in the case of training samples of small size.