Heidelberg 2022 – wissenschaftliches Programm
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T: Fachverband Teilchenphysik
T 26: Data Analysis, Information Technology and Artificial Intelligence
T 26.5: Vortrag
Montag, 21. März 2022, 17:15–17:30, T-H39
High-pT b-tagging using track classification in the ATLAS experiment — Beatrice Cervato, Markus Cristinziani, Gabriel Gomes, Vadim Kostyukhin, •Katharina Voß, and Wolfgang Walkowiak — Center for Particle Physics Siegen, Experimentelle Teilchenphysik, Universität Siegen
In the ATLAS experiment the search for new physics beyond the Standard Model is of particular interest. In many theories, new physics processes result in the production of energetic b-quarks, fragmenting to high-pT jets in the detector. Many successful b-jet identification algorithms suffer from the jet energy increase due to higher multiplicity of fragmentation tracks, reduced track reconstruction efficiency and, looking ahead to the High-Luminosity LHC, increased pile-up. As b-tagging algorithms typically use properties of the track-in-jet ensemble, the increased multiplicity of fragmentation tracks in energetic jets inevitably decreases the b-tagging efficiency at high pT. A b-tagging algorithm, based on a multivariate technique, particularly suited for very energetic events, is presented. The multiplicity problem is solved by considering only those tracks, which are most likely to stem from a B-hadron decay. These are identified through a multi-class multivariate track classification algorithm, considering heavy flavour, fragmentation and other tracks from material interactions, as well as pile-up tracks.