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T: Fachverband Teilchenphysik

T 18: Top: tt Wirkungsquerschnitt, tt Modelling, tt+bb, t→Ws

T 18.8: Talk

Monday, March 9, 2015, 15:45–16:00, K.11.10 (K8)

Measurement of the pp→ ttbb cross-section with ATLAS 8 TeV data — •Spyridon Argyropoulos and Judith Katzy — DESY, Hamburg

The ttbb process is the dominant irreducible background for the widely sought ttH(H→ bb) and suffers from large theoretical uncertainties. Therefore an experimental determination of its cross-section is necessary. The talk presents the measurement of the ttbb production cross-section using 8 TeV ATLAS data. The measured cross-section is in agreement with QCD predictions with the precision being competitive with the NLO QCD calculations.