TY  - THES
AB  - This thesis presents measurements of inclusive and differential production cross sections of top- anti-top-quark pairs in association with an additional prompt photon ttγ in the single lepton final state at the LHC analysing data recorded by the ATLAS detector. The data analysed corresponds to 20.2 fb-1 of integrated luminosity recorded during 2012 at a center-of-mass energy of √s = 8 TeV. The cross.section is measured with a template fit method. Background processes are estimated with data driven and Monte Carlo based methods. The differential cross section is measured as a function of transverse momentum and pseudo-rapidity of the photon. A total of 1256 and 1816 candidate ttγ events are observed in the electron and muon channel, respectively. Both inclusive and differential measurements are performed in a fiducial phase space within the detector acceptance. The differential measurements are performed as a function of transverse momentum and pseudo-rapidity of the photon. The inclusive ttγ production cross section times the branching ratio (BR) is measured to be 71.4 ± 13.0 fb in the electron channel. The measured cross section in the muon channel reads 70.0 ± 9.8 fb. The results are in agreement within the uncertainties with the corresponding Standard model predictions at next-to-leading order.
AU  - Atlay, Naim Bora
DA  - 2017
KW  - ATLAS < Teilchendetektor>
KW  - Physik
KW  - Experimentelle Teilchenphysik
KW  - ATLAS Experiment
KW  - CERN
KW  - Top-Quark
KW  - Physics
KW  - Experimental particle physics
KW  - ATLAS experiment
KW  - Top-quark
LA  - eng
PY  - 2017
TI  - Differentiating top-quark - photon coupling: inclusive and differential cross-section measurements of top-quark pair production in association with a photon in the single lepton channel in pp collisions data at √s 8TeV with the ATLAS experiment
UR  - https://nbn-resolving.org/urn:nbn:de:hbz:467-13385
Y2  - 2024-11-22T03:26:56
ER  -