A continuous calibration of the ATLAS flavour-tagging classifiers via optimal transportation maps

Summary, in English

A calibration of the ATLAS flavour-tagging algorithms using a new calibration procedure based on optimal transportation maps is presented. Simultaneous, continuous corrections to the b-jet, c-jet, and light-flavour jet classification probabilities from jet-tagging algorithms in simulation are derived for b-jets using tt¯→eμννbb data. After application of the derived calibration maps, closure between simulation and observation is achieved for jet flavour observables used in ATLAS analyses of Large Hadron Collider (LHC) Run 2 proton-proton collision data. This continuous calibration opens up new possibilities for the future use of jet flavour information in LHC analyses and also serves as a guide for deriving high-dimensional corrections to simulation via transportation maps, an important development for a broad range of inference tasks. © CERN for the benefit of the ATLAS Collaboration 2025.

• Author: G. Aad; T.P.A. Åkesson; K.S.V. Astrand; C. Doglioni; P.A. Ekman; V. Hedberg; H. Herde; B. Konya; E. Lytken; R. Poettgen; O. Smirnova; E.J. Wallin; L. Zwalinski
• Department/s: Particle and nuclear physics; eSSENCE: The e-Science Collaboration; Department of Physics
• Publishing year: 2025
• Language: English
• Publication/Series: European Physical Journal C
• Volume: 85
• Issue: 11
• Links: http://dx.doi.org/10.1140/epjc/s10052-025-14682-0
• Document type: Journal article
• Publisher: Springer Nature
• Topic: Subatomic Physics
• Keywords: Classification (of information); Colliding beam accelerators; Fighter aircraft; High energy physics; Maps; Microstrip devices; Calibration procedure; Continuous calibrations; High-dimensional; Higher-dimensional; Large Hadron Collider; Large-hadron colliders; Optimal transportations; Proton proton collisions; Calibration
• Status: Published
• ISBN/ISSN/Other: ISSN: 1434-6044