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T: Fachverband Teilchenphysik

T 35: Top-Quarks 3

T 35.2: Vortrag

Montag, 4. März 2013, 17:00–17:15, HSZ-02

Study of Anomalous Couplings in the ttgamma Vertex with 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 B, RWTH Aachen

We investigate the top quark pair production with an associated photon in the final state to examine the electromagnetic top quark coupling. Among other observables, a deviation in the shape of the photon energy spectrum with respect to Standard Model predictions would indicate modifications in the ttgamma vertex and therefore reveal new physics. A Monte Carlo benchmark study is performed using the generator tool WHIZARD. A cut based event selection is implemented to focus on top pair events in the muon+jets channel. On top of this preselection, ttgamma candidates are identified by requiring a well isolated, high energetic photon. Preliminary results about the sensitivity of appropriate observables are obtained using Monte Carlo simulated events which are then compared to data collected with the CMS detector at LHC.