Wuppertal 2015 – wissenschaftliches Programm
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T: Fachverband Teilchenphysik
T 21: Top: tt+2 Photonen, tt+Z
T 21.2: Vortrag
Montag, 9. März 2015, 17:00–17:15, L.09.31 (HS 11)
Probing the top-quark photon vertex with the CMS detector — •Till Arndt1, Heiko Geenen2, Felix Höhle2, and Heiner Tholen3 — 1DESY Hamburg — 2III Phys. Inst. B, RWTH Aachen University — 3Universität Hamburg
The electromagnetic top-quark coupling is of essential interest to many models beyond the Standard Model as well as to background contribu- tion for Higgs searches. We investigate this coupling utilizing top-quark pair events with a photon in the final state with the CMS detector. We present an updated measurement of the cross section at a center-of-mass energy of √s= 8 TeV. This measurement is performed in the muon + jets channel using data taken in 2012. The result of σt t + γCMS =2.6 ±0.1 (stat.) ±0.5 (syst.) pb is compatible with the Standard Model prediction of σt t + γSM = 1.8± 0.5 pb.