Hamburg 2016 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 101: Top Quark V (Wirkungsquerschnitte)

T 101.6: Vortrag

Donnerstag, 3. März 2016, 18:00–18:15, VMP9 HS

tt cross section measurement in the semi-leptonic channel at 8 TeV with the ATLAS Experiment — •Arwa Bannoura and Peter Mättig — Bergische Universität Wuppertal, Wuppertal, Germany

A precise measurement of the top quark properties is of great importance. In this analysis, the top pair production cross section in the semi-leptonic channel is measured using event shape based observables that discriminate tt events from the backgrounds. These variables are fed into an artificial neural network (ANN) in order to improve the separation strength between the signal and the backgrounds. The ANN output templates for all processes are then fitted to data using a binned maximum likelihood method. In this context, the main background which is W+jets is estimated completely from data using a new approach. Also, new ideas are proposed to constrain systematic uncertainties in order to improve the precision of the measurement.