PoS - Proceedings of Science
Volume 449 - The European Physical Society Conference on High Energy Physics (EPS-HEP2023) - T12 Detector R&D and Data Handling
Automation of the b-tagging calibration software in the ATLAS experiment
M. Barakat*  on behalf of the ATLAS Collaboration
Full text: pdf
Pre-published on: January 30, 2024
Published on: March 21, 2024
Particle cascades originating from quarks and gluons decays (jets) are omnipresent in proton- proton collisions at the LHC. The identification of jet flavours is essential for many physics searches at the ATLAS experiment. This is achieved using machine learning algorithms (taggers) which combine tracks and jets information to determine the flavour of the jets (b-jets, c-jets and light jets). These taggers are trained with simulated Monte Carlo events and, due to simulations imperfections, their performance need to be measured in data in order to extract correction factors for the simulation predictions. ATLAS developed a set of calibration techniques for different jets flavours to correct, then the correction factors need to be re-derived every time a new tagger is deployed. While reproducing the calibration results is a complex task that requires some expertise, automating the calibration workflow significantly accelerates the calibration cycle and makes it less prone to manual mistakes by offering a straightforward solution for results reproducibility. We present the first automated calibration framework in ATLAS using REANA platform. The results are compared with the official results using 36.2 fb-1 of 13 TeV collisions data from ATLAS, and a new set of calibration results with a customised setup is also included. The same method can be applied in other contexts to reduce the amount of time and resources needed to achieve the scientific goals.
DOI: https://doi.org/10.22323/1.449.0576
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