Heidelberg 2022 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 34: Top Quarks: Properties -2

T 34.1: Vortrag

Dienstag, 22. März 2022, 16:15–16:30, T-H19

Measurement and EFT interpretation of differential tt cross-sections in the boosted lepton+jets channel with the ATLAS detector at √s = 13 TeV — Kevin Kröninger, Johannes Erdmann, and •Kevin Sedlaczek — TU Dortmund University, Department of Physics

Physics beyond the Standard Model (SM) can, in absence of resonances, be investigated in a model-independent way by using effective field theory (EFT) approaches. Without assumption of the underlying theory, effects of potential new high-mass particles at a low energy scale can be quantified by higher dimension expansions of the SM Lagrangian.

At the LHC, physics in the top sector is entering a phase of precision measurements combined with very accurate predictions. Meanwhile, many theories beyond the SM predict deviations in the top-quark couplings or new interactions of the top quark. These aspects make model-independent measurements in the top sector a very attractive way to test the SM for deviations arising from new physics at higher energy scales.

In this talk, a differential tt cross-section measurement is shown. The measurement is performed in the boosted lepton + jets channel on the full Run 2 dataset taken with the ATLAS detector at √s=13 TeV. The differential measurements in different kinematic variables are unfolded to the particle level. One of the unfolded distributions is then used to derive bounds on the contributions of new physics within the EFT framework via two dimension-6 operators.