Bonn 2020 – scientific programme

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T: Fachverband Teilchenphysik

T 10: Top quarks: pair production and tagging

T 10.2: Talk

Monday, March 30, 2020, 16:45–17:00, H-HS XI

Studies of tt production with additional heavy flavour jets in p-p collision with the ATLAS detector — •Lucas Klein, Mahsana Haleem, and Raimund Ströhmer — 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. In order to differentiate the b-jets coming directly from top-quark decays to those emerging from the gluon splitting, an algorithm is developed. This algorithm assigns the b-jets to top-quarks based on the kinematics of the final state objects, such as distributions of angular distances between objects and invariant masses. The performance of this algorithm as well as the distributions of additional jet-multiplicity and kinematics of various objects will be presented.