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T: Fachverband Teilchenphysik

T 32: Top-Quark: Produktion 1

T 32.4: Talk

Monday, February 27, 2012, 17:30–17:45, ZHG 104

Measurement of tt cross-section systematic uncertainties for 1-b and 2-b tagged samples in the lepton plus jets channel at ATLAS — •Andrey Khoroshilov, Marcello Barisonzi, Peter Mättig, and Markus Mechtel — Bergische Universität Wuppertal, Wuppertal, Germany

The ability to identify jets originating from b-quarks is important for the measurement of the tt cross-section. This information allows one to distinguish between signal and background events, significantly increasing the purity of selected data. The lower number of events of the 2-b tag sample is compensated by a higher background rejection. Hence, systematic errors for such processes as W+jets and QCD multijet are strongly suppressed for 2-b tag sample. The study provides comparison of systematic uncertainties for 1-b and 2-b tag samples.