Erlangen 2026 – scientific programme

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T: Fachverband Teilchenphysik

T 6: Electronics, Trigger, DAQ I

T 6.4: Talk

Monday, March 16, 2026, 17:00–17:15, KH 00.023

Electron algorithm studies for the ATLAS forward Feature Extractor — •Florian Harz, Hannes Mildner, and Stefan Tapprogge — Institut für Physik, JGU, Mainz, Germany

The High-Luminosity LHC upgrade presents unprecedented challenges for real-time event selection in the ATLAS experiment, driven by significantly increased rates, pile-up conditions, and the need for fast, high-precision triggering. The forward Feature Extractor (fFEX) board, based on high-performance FPGAs, will play a central role in the Level-0 calorimeter trigger, enabling low-latency identification of electromagnetic signatures in the forward area. This presentation summarizes recent algorithmic studies performed for the fFEX electron identification pipeline, highlighting strategies that balance physics performance with the stringent timing and resource constraints inherent to FPGA-based processing. A sliding-window algorithm has been implemented in firmware to act as a baseline comparison as it has been used previously used in ATLAS calorimeter triggering. Building on this, the use of machine-learning approaches is explored with the goal to have a full implementation in firmware that surpasses the legacy sliding-window method.

Keywords: Electrons; Algorithm Studies; fFEX; Trigger; ATLAS