ATLAS Offline software

Welcome to ATLAS Athena software!

Please visit the public documentation for this project. To contribute or to read about our development workflow, follow the developers' instructions.

For ATLAS members, please see the Atlas Computing Twiki for even more information.

Branches

The following major branches are currently active:

Branch	Purpose	Main Project, Release Series
main	Upgrade, Analysis, Derivations	Athena 25.0.X, (Ath)AnalysisBase 25.2.X
24.0	Run-3 Tier0, Point1, MCProd	Athena 24.0.X, AthSimulation 24.0.X
21.2	Legacy run 2 derivations	AthDerivation 21.2.X

Links

• The ATLAS webpage will tell you all about the ATLAS experiment (for ATLAS members, the collaboration webpage is here)
• The software documentation page is the main public entry point for this project
• The Twiki is the main source of internal documentation, and has many links to sub-domains
• The git repository is here
• The ATLAS Nightlies and CI page shows the build status of all nightlies
• The Doxygen code documentation is available for the main branch
• To cite Athena, you can use the following zenodo DOI