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T: Fachverband Teilchenphysik

T 28: Top quark production II

T 28.2: Vortrag

Dienstag, 16. März 2021, 16:15–16:30, Tc

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

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 particles at a low energy scale can be quantified by higher dimension expansions of the SM Lagrangian at a much higher energy scale.

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 couplings or new interactions coupling to the top quark. These aspects combined 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, studies on a differential tt cross-section measurement are shown. The analysis is performed in the boosted lepton + jets channel on the full Run 2 dataset taken with the ATLAS detector at √s=13 TeV. The EFT framework is used to derive bounds on the contributions of new physics via two EFT operators. The choice of variables for the unfolded differential distributions on basis of their sensitivity to the EFT operators as well as first simulation-based studies are presented.