| Issue |
EPJ Web Conf.
Volume 337, 2025
27th International Conference on Computing in High Energy and Nuclear Physics (CHEP 2024)
|
|
|---|---|---|
| Article Number | 01259 | |
| Number of page(s) | 6 | |
| DOI | https://doi.org/10.1051/epjconf/202533701259 | |
| Published online | 07 October 2025 | |
https://doi.org/10.1051/epjconf/202533701259
Versioning of the DD4hep-based LHCb Detector Description
1 CERN
2 The University of Warwick
* e-mail: mexu@cern.ch
Published online: 7 October 2025
The LHCb Detector software project is home to the detector description of the LHCb experiment, utilized across all data processing applications, from simulation to reconstruction. It is based on the DD4hep package relying on the combination of XML files and C++ code. A suite of custom developments were introduced to support different versions of the detector layout in different data taking periods.
The detector descriptions are organized into self-contained, versioned component folders, each containing C++ code and DD4hep CompactXML files. The description of the overall LHCb detector combines specific versions of the components for the period being described. When a sub-detector is identical in two LHCb layouts it can be loaded by both, avoiding code duplication and facilitating future upgrade simulation studies. A convention for naming the versions consistent between the components and the whole detector has been set up. Dependency and convention checks as well as geometry monitoring are enforced by using GitLab’s CI testing. Critically, they include verifications that changes introduced do not affect existing versions.
© The Authors, published by EDP Sciences, 2025
This is an Open Access article distributed under the terms of the Creative Commons Attribution License 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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