PoS - Proceedings of Science
Volume 449 - The European Physical Society Conference on High Energy Physics (EPS-HEP2023) - T12 Detector R&D and Data Handling
Automated alignment calibration in CMS during Run 3
L.P. Nair*  on behalf of the CMS Collaboration
Full text: pdf
Pre-published on: December 14, 2023
Published on: March 21, 2024
The LHC physics program requires a robust and efficient reconstruction of the trajectories of charged particles, as well as precise measurement of primary and secondary vertices and impact parameters. Several changes during data-taking, including the radiation damage introduced by the high particle flux, influence the particle position measurements. In order to exploit the physics potential of the Compact Muon Solenoid (CMS) detector, the calibration challenge consists of providing calibration constants with a fast turnaround, addressing the changes in the running conditions to ensure an efficient online event selection by the high-level trigger system and good quality first reconstruction of physics objects. To achieve this, several automated workflows have been developed. The update of the tracker detector geometry is performed by one such automated workflow, running on the most recent data and regularly updating the so-called alignment parameters within 48 hours. Thus, changes to the position and orientation of the tracker modules are periodically accounted for in the reconstruction. This contribution reviews the design and operational experience of the automated alignment calibration in place for the alignment of the CMS tracker detector, with an emphasis on the recent developments for the Run 3 data-taking period.
DOI: https://doi.org/10.22323/1.449.0595
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