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T: Fachverband Teilchenphysik

T 35: Top-Quarks 3

T 35.1: Talk

Monday, March 4, 2013, 16:45–17:00, HSZ-02

Probing TTGamma at the CMS Experiment — Markus Backes, Günter Flügge, Heiko Geenen, Wael Haj Ahmad, Felix Höhle, Yvonne Küssel, Oliver Pooth, Achim Stahl, and •Heiner Tholen — III. Physikalisches Institut; RWTH Aachen

Photon radiation associated top quark pair production is investigated to quantify the electromagnetic coupling of quarks. The top-quark couplings are expected to be sensitive to effects of physics beyond the Standard Model. Generally, such effects can be spotted by probing top-correlated photon observables. We present a measurement of the inclusive cross section of the top-pair plus photon production, taking the course of a cumulative approach. Using a cut based event selection, we focus on top-pair events in the muon+jets channel with an additional high-energetic and well-isolated photon. The signal process (pp → q q b b µ ν_µγ) is simulated with the LO event generator WHIZARD. A template-fit technique is applied to estimate the misidentification rate of photons in selected events. Preliminary results are presented with CMS-recorded data at sqrt(s)=8 TeV.