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T: Fachverband Teilchenphysik

T 36: Top-Quarks

T 36.3: Talk

Monday, March 24, 2014, 17:15–17:30, P102

Estimation of the W+Jets background in tt events using a matrix method at the ATLAS experiment — •Michael Homann, Ingo Burmeister, Hendrik Esch, Christian Jung, and Tobias Kupfer — TU Dortmund, Lehrstuhl für Experimentelle Physik IV, 44221 Dortmund, D

One of many measurements at the ATLAS Experiment at the LHC is the determination of properties of the top quark in tt decays. For these measurements it is essential to determine an appropiate description of the background events.

One major background source are W+Jets events. In these events a W-Boson and up to serveral jets are generated at the primary vertex. Therefore they are very similiar to a semileptonic tt event. At the moment the amount of W+Jets events is estimated by Monte Carlo simulations. Another possibility is using a matrix method. This data-driven approach is already used to estimate the QCD background based on lepton isolation criteria.

In this talk a short overview of the matrix method is given. Following a first attempt to estimate the W+Jets background based on b-tagging requirements is presented.