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arXiv · 2508.20728

Photon reconstruction using the Hough transform in imaging calorimeters

Yang Zhang·Shengsen Sun·Weizheng Song·Fangyi Guo·Yuanzhan Wang·Linghui Wu·Yifang Wang
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Abstract

Photon reconstruction in calorimeters represents a crucial challenge in particle physics experiments, especially in high-density environments where shower overlapping probabilities become significant. We present an energy-core-based photon reconstruction method. It is achieved through extending the application of the Hough transform to exploit the energy-core structure of photon showers. The method, validated through simulations of the CEPC crystal electromagnetic calorimeter, achieves a reconstruction efficiency of nearly 100% for photons with energies exceeding 2 GeV and a separation efficiency approaching 100% for two 5 GeV photons, when the distance between them reaches the granularity limit of the calorimeter. This energy-core-based photon reconstruction method, integrated with an energy splitting technique, enhances the performance of photon measurement and provides a promising tool for imaging calorimeters, particularly those requiring high precision in photon detection in complex event topologies with high multiplicity.

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Yang Zhang, Shengsen Sun, Weizheng Song, Fangyi Guo, Yuanzhan Wang, Linghui Wu, Yifang Wang. 2025-08-28. Photon reconstruction using the Hough transform in imaging calorimeters. https://doi.org/10.1088/1748-0221%2F21%2F03%2Fp03003

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