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Draft: Fixing wrong A/CSideYOffset values of Muon Stations for 2026 Data taking and MC Productions

Erika De Luciarequested to merge
edelucia_MuonYposFix into master

These are the changes needed in the Muon geometry parameters.xml to fix the wrong A/CSideYOffset values for Muon Stations, as discovered with the Muon alignment lhcb-conddb/lhcb-conditions-database!199 (merged).

This bug affects Run3 Muon geometry description only and both DetDesc and DD4hep descriptions.

See slides presented at the Simulation meeting https://indico.cern.ch/event/1580357/contributions/6660608/attachments/3132482/5557329/MuonDeLuciaSimMeet_9Sep2025.pdf

To be used both for 2026 Data taking and MC production campaigns.

Validated by

  • Core Software
  • RTA
  • Simulation
Edited by Erika De Lucia

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