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T: Fachverband Teilchenphysik

T 79: Top quark production III

T 79.1: Vortrag

Donnerstag, 18. März 2021, 16:00–16:15, Td

Studies of tt production with additional heavy flavour jets in p-p collision with the ATLAS detector — •Lucas Klein, Mahsana Haleem, and Raimund Ströhmer — Julius-Maximilians-Universität Würzburg

The production of tt-pairs with additional jets provides a strong test of quantum chromodynamics (QCD) predictions at high orders. Furthermore, this represents as a significant background to rare SM processes (e.g. ttH, tt tt), as well as to processes beyond the standard model. The additional jets consisting of b-quarks originating from gluon splitting are particularly interesting in constraining uncertainties in the prediction of the process.

In this talk, we will show studies of tt-pair production with additional b-jets in the dileptonic top decay channel using full Run 2 ATLAS data from proton-proton collision at √s=13 TeV. Events are chosen by requiring an oppositely-charged eµ-pair and at least two b-jets in the final state as a baseline selection. The backgrounds originating from tt events with additional light- or c-flavour jets (ttl, ttc) misidentified as b-jets in exclusive 3 b-tagged jet and ≥ 4 b-tagged jet regions are estimated using a data-driven method. The additional jet multiplicity and various kinematic distributions in the tt predictions will be compared to the data at the particle-level in ≥3 b-jet and ≥ 4 b-jet regions.