SMuK 2023 – scientific programme

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T: Fachverband Teilchenphysik

T 130: Top II

T 130.1: Talk

Thursday, March 23, 2023, 17:30–17:45, HSZ/0401

Measurement of the production cross-section of a W boson in association with tt — •Marcel Niemeyer, Arnulf Quadt, and Elizaveta Shabalina — Georg-August-Universität Göttingen

The top-quark pair production in association with a W boson is an important background to processes like ttH or 4-tops production. Due to higher order electroweak corrections, the process is difficult to model. In consequence, a tension of the predicted and observed rate of ttW surpassing 2σ has been observed in previous analyses. Thus, it is of high importance to increase our understanding of it.

This talk will give an overview of the measurement of the ttW cross-section in the multi-lepton channel with two same sign or three leptons (electrons or muons), using the full Atlas Run 2 dataset. In addition to a measurement in the inclusive phase space, the extraction of the cross-section in a fiducial phase space, as well as the measurement of the ratio σ(ttW⁺)/σ(ttW⁻) will be discussed. The fit to extract the cross-section is performed simultaneously to a template fit estimating the main background contributions.