Recent Progress in CMS High-Granularity Calorimeter (HGCAL) Performance for the Phase-2 Upgrade

Yu-Wei Kao^1*

¹Physics, National Taiwan University, Taipei, Taiwan

* Presenter:Yu-Wei Kao, email:xiaokao5@gmail.com

The CMS Phase-2 upgrade projects will replace endcap calorimeters with a high-granularity calorimeter (HGCAL) for the challenges expected in the high-luminosity LHC era. HGCAL is a silicon-based sampling calorimeter with 47 sensitive layers per endcap designed to measure five-dimensional information: energy, spatial position (x, y, z), and time. This functionality enables handling of high pile-ups and ensures optimal particle reconstruction performance in the forward region. The detector's performance has been continuously explored through various aspects, including Geant4 simulation, system validation tests, and the development of particle reconstruction algorithms. This talk will give an overview of the recent progress from the HGCAL detector performance group, including the 2025 test beam campaign, cassette tests, and software development.

Keywords: High-Luminosity LHC, CMS Phase-2 Upgrade, High-Granularity Calorimeter (HGCAL)