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T: Fachverband Teilchenphysik
T 10: Top quarks: pair production and tagging
T 10.4: Vortrag
Montag, 30. März 2020, 17:15–17:30, H-HS XI
Measurement and EFT interpretation of the tt cross section in the boosted lepton+jets channel with the ATLAS detector at √s = 13 TeV — •Kevin Sedlaczek, Johannes Erdmann, and Kevin Kröninger — TU Dortmund, Experimentelle Physik IV
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 can be quantified by higher dimension expansions of the SM Lagrangian at a 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 in variables including properties of additional jets are shown. The analysis is performed in the boosted lepton + jets channel on the full 139 fb−1 Run 2 dataset taken with the ATLAS detector at a centre-of-mass energy of √s=13 TeV. In order to derive bounds on the contributions of new physics within the EFT framework, the choice of variables for the unfolded differential distributions is investigated for sensitivity to the EFT operators.