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T: Fachverband Teilchenphysik

T 79: Top quark production III

T 79.7: Vortrag

Donnerstag, 18. März 2021, 17:30–17:45, Td

Calibration of the prompt lepton veto in a cross-section measurement of top-quark pair production in association with a W boson — •Marcel Niemeyer, Arnulf Quadt, Elizaveta Shabalina, and Knut Zoch — II. Physikalisches Institut, 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 mismodelling of ttW has been observed in previous analyses. Thus, it is of high importance to increase our understanding of it. The analysis is performed in the multi-lepton channel, i.e. 2ℓ (same-sign) and 3ℓ, with a significant contribution from fake backgrounds. To suppress them, a prompt lepton veto is used. Its improvement and calibration will be discussed in this talk.