SMuK 2023 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 57: Single Top – Higgs Top

T 57.1: Vortrag

Mittwoch, 22. März 2023, 15:50–16:05, HSZ/0101

EFT interpretation of a t-channel single top-quark production cross-section measurement in proton-proton collisions at a centre-of-mass energy of 13 TeV with the ATLAS detector — Benedikt Gocke², Dominic Hirschbühl¹, Joshua Reidelstürz¹, •Maren Stratmann¹, and Wolfgang Wagner¹ — ¹Bergische Universität Wuppertal, Wuppertal, Deutschland — ²Technische Universität Dortmund, Dortmund, Deutschland

Effective field theories (EFTs) provide a model-independent approach for searches for physics beyond the Standard Model (SM). The impact of new physics at high energy scales is parameterized by higher-dimension operators extending the SM Lagrangian.

In this talk, an EFT interpretation of a t-channel single top-quark production cross-section measurement is presented. Constraints on the four-fermion operator O_qQ^(1,3) are set. The impact of a non-zero contribution of O_qQ^(1,3) is studied from dedicated samples with simulated events. Constraints on the operator strength are set from a fit to data collected by the ATLAS detector from 2015 to 2018 at a centre-of-mass energy of 13 TeV.