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T: Fachverband Teilchenphysik
T 69: Methods in Particle Physics IV
T 69.3: Vortrag
Donnerstag, 19. März 2026, 16:45–17:00, KH 00.020
Tagging at ATLAS with GN3: Beyond heavy-flavour — •Diptaparna Biswas1 and ATLAS Collaboration2 — 1Center for Particle Physics Siegen, Experimentelle Teilchenphysik, Universität Siegen, Germany — 2CERN, Geneva, Switzerland
Accurate identification of jets that originate from heavy-flavour hadrons is pivotal for many ATLAS analyses, from Higgs-boson and top-quark measurements to searches for new physics. We present GN3, our newest jet flavour tagger, which introduces a full-transformer architecture tailored to the environment of LHC Run-2 and Run-3.
GN3 processes low-level track, neutral particle, and muon information to extract correlations between the inputs and infer the origin of the jet. Compared with the current Run-3 baseline, GN2, the new model achieves a significantly better separation of b- and c-jets from light-flavour jets across a wide kinematic phase-space.
In this talk, we will discuss the architecture and training workflow, as well as the newest results from GN3. Furthermore, we will highlight the new capabilities added to GN3, which extend its functionality into the realm of s-tagging.
Keywords: FTAG; Jet Tagging; s-tagging; ML; Transformer