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T: Fachverband Teilchenphysik
T 43: Poster session Particle Physics
T 43.2: Poster
Dienstag, 31. März 2020, 17:00–18:30, Grotte
Measurement of the total cross-section of single top-quark and top-antiquark t-channel production in pp collisions at √s = 13 TeV — Olga Bessidskaia Bylund, Dominic Hirschbuehl, Joshua Aaron Reidelsturz, •Mohsen Reazei Estabragh, and Wolfgang Wagner for the ATLAS collaboration — Bergische Universität Wuppertal, Wuppertal, Germany
In leading-order perturbation theory, single top-quark production is described by three sub-processes that are distinguished by the virtuality of the exchanged W boson. In this analysis, t-channel which is the dominant process is the subject of the measurements, using the lepton+jets channel.
Studying the cross-section ratio of top to antitop (Rt) could be helpful for testing different PDF sets from various groups. Calculation of Rt for the newest PDF sets has carried out in the 5-flavour scheme at NLO using the Hathor program. As many systematic uncertainties on Rt are canceled out, we focus on the impact of PDF, αs and scale uncertainty.
Predictions for the signal process is being compared using different generators, such as POWHEG and aMC@NLO in addition to new predictions from SHERPA and MINLO.
To reduce uncertainty on the jet energy scale (JES), flavour composition and its uncertainty for the signal sample has studied.