Erlangen 2026 – scientific programme

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T: Fachverband Teilchenphysik

T 23: Top Physics I

T 23.4: Talk

Tuesday, March 17, 2026, 17:00–17:15, KH 00.011

Studies of the tt+heavy flavour jets using the ATLAS data — •Abderahmane Maiza, Mahsana Haleem, and Raimund Ströhmer — Universität Würzburg, Germany

The top-quark pair production in association with heavy-flavour jets provides an essential test of quantum chromodynamics (QCD) predictions. These processes are challenging to model and constitute large irreducible background to rare SM processes such as ttH and tH productions as well as to the processes predicted by several extensions of the Standard Model.

The fiducial and differential cross-sections of tt+b-jets have been measured using the ATLAS Run-2 data with precision ranging from 8.5% − 20%. Inclusive cross-section of tt+c-jets has been measured with the precision of 15% − 20% in given phase space. Further improvements in these measurements are expected through exploitation of the full ATLAS Run-2 and Run-3 datasets, improved MC simulations, advanced background estimation techniques and enhanced b-/c-jet origin classification leading to better event construction.

This talk will present the ongoing developments on the b-jets classifications in ttbb events using a transformer network. Furthermore, the method for the simultaneous estimation of flavour composition of additional jets in tt+jets events will be presented.

Keywords: Heavy flavour jets; Standard Model; Machine learning; b-tagging; top pair production