Trigger Primer
This page provides a collection of resources for anyone who wants to learn about the ATLAS Trigger system. Links may require a CERN login and/or ATLAS affiliation.
Where to get help
- Ask your general questions on the atlas-talk.web.cern.ch site, specifically on the Trigger Help forum.
- Questions about developing HLT software can be raised on this Mattermost channel
- You will need to be subscribed to the
atlas-softwareMattermost group.
Physics Briefings -- outreach-level material
- Overview of the Run 3 Trigger
Short introductions from ATLAS Induction Days
- More emphasis on Trigger: 24.03.2024
- More emphasis on DAQ: 11.03.2024
Relevant ATLAS lectures (with recordings)
- The ATLAS Trigger System: 19.03.2024
- Data Acquisition (DAQ) in ATLAS: 27.02.2024
- The ATLAS data processing workflow: 14.11.2023
- Trigger Level Analyses: 15.04.2025
The full lecture series has an Indico category here.
Trigger software tutorials
Sessions held on 11-12 Feb 2025 (with recordings)
- Topics:
Additionally, see:
- Trigger introduction in the analysis software tutorial
Trigger publications
Comprehensive public results can be found on the TriggerPublicResults page. The top of the page contains links to the most current journal articles on the full system and each signature. CONF and PUB notes on the same page may have more recent preliminary results.
Other highlights:
- Trigger Level Analysis PUB ATL-DAQ-PUB-2017-003
- This describes the use of HLT reconstructed objects for physics analyses with very high trigger rates
- Enhanced Bias PUB ATL-DAQ-PUB-2016-002
- This describes the mechanism behind the datasets used for trigger rate estimates
Glossaries
- Trigger glossary for Run 3
- ATLAS acronym list (pdf)
- Limited to acronyms defined at the time of the ATLAS detector publication in JINST (2008)