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Add a page on decays before transport - #64

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sawenzel merged 1 commit into
AliceO2Group:mainfrom
sawenzel:doc/pre-transport-decay
Oct 22, 2026
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sawenzel merged 1 commit into
AliceO2Group:mainfrom
sawenzel:doc/pre-transport-decay

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This PR adds a page "Decays before transport" to the generator documentation. It explains why intermediate resonances are missing from the MC truth when Geant4's external decayer decays a particle, and how the new decay step in event generation (EventDecayer) avoids that.

The page documents the EventDecayer keys with usage examples for event pools and Kine replay, the O2DPG usage (event-generation task, off for pool creation), and adds a diagram of both decay routes.

Relates to AliceO2Group/AliceO2#15995
https://its.cern.ch/jira/browse/O2-5903

Assisted by Claude Code.

This commit adds a page that explains the decay step in event generation (EventDecayer) and how to configure it.

- It explains why intermediate resonances are missing from the MC truth when Geant4's external decayer is used.
- It documents EventDecayer.enable and the other EventDecayer keys, with usage examples for event pools and Kine replay.
- It adds a diagram of both decay routes.

https://its.cern.ch/jira/browse/O2-5903

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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sawenzel merged commit 6fdd042 into AliceO2Group:main Oct 22, 2026
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sawenzel deleted the doc/pre-transport-decay branch October 22, 2026 19:08
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