The ATLAS Trigger System
Instrumentation and Detectors
2026-03-17 v1 High Energy Physics - Experiment
Abstract
The ATLAS Trigger system is a key component of the ATLAS experiment at the CERN Large Hadron Collider (LHC), designed to reduce the event rate from the 40 MHz proton-proton bunch crossing frequency to an output suitable for offline storage and analysis. During Run-3 (2022-2026), major upgrades were implemented in both the hardware-based Level-1 (L1) Trigger and the software-based High Level Trigger (HLT), to cope with increased luminosity and pile-up conditions. This paper summarises the main features of the ATLAS Trigger system, its performance in Run-3, and its role in enabling precision measurements and new physics searches.
Cite
@article{arxiv.2603.13409,
title = {The ATLAS Trigger System},
author = {Leonardo Toffolin},
journal= {arXiv preprint arXiv:2603.13409},
year = {2026}
}