| Issue |
EPJ Web Conf.
Volume 337, 2025
27th International Conference on Computing in High Energy and Nuclear Physics (CHEP 2024)
|
|
|---|---|---|
| Article Number | 01059 | |
| Number of page(s) | 6 | |
| DOI | https://doi.org/10.1051/epjconf/202533701059 | |
| Published online | 07 October 2025 | |
https://doi.org/10.1051/epjconf/202533701059
ATLAS software tools to handle ROOT RNTuple*
1 Université Paris-Saclay, CNRS/IN2P3, IJCLab (FR)
2 Argonne National Laboratory (US)
3 Brookhaven National Laboratory (US)
* Copyright 2025 CERN for the benefit of the ATLAS Collaboration. CC-BY-4.0 license.
** e-mail: Grigori.Rybkine@cern.ch
Published online: 7 October 2025
The software of the ATLAS experiment at the CERN LHC accelerator contains a number of tools to inspect (validate, summarize, peek into etc.) all its official data formats recorded in ROOT files. These tools — mainly written in the Python programming language — handle the ROOT TTree which is currently the main storage object format of ROOT files. However, the ROOT project has developed a successor to TTree, called RNTuple. The new storage format offers significant improvements and ATLAS plans to adopt it in LHC Run 4. Work is ongoing to enhance the tools in order to handle the RNTuple storage format in addition to TTree in a transparent way for the user. The work is aided by modern and detailed APIs provided by RNTuple. In this paper we present the progress made and lessons learned.
© The Authors, published by EDP Sciences, 2025
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