TY  - THES
A3  - Fleck, Ivor
AB  - Absolute and normalised differential cross-sections for the associated production of top quarks with a photon are measured in proton-proton collisions data at a centre-of-mass energy of 13 TeV. The data were collected by the ATLAS detector during the full Run 2 of the LHC with an integrated luminosity of 139 fb^{-1}. The measurements are performed in the electron-muon decay channel in a fiducial phase space at parton level. The signal region is characterised by events with exactly one hard photon, one electron and one muon of opposite charge, at least two jets, among which at least one is b-tagged, and missing transverse energy. The differential cross-sections are measured as functions of photon kinematic observables, the minimum angular distance between the photon and the leptons, and angular separations between the two leptons. The results are compared to the most recent theory prediction at next-to-leading-order accuracy in QCD and state-of-the-art Monte Carlo simulations. The measurements are found to be in agreement with the Standard Model predictions within uncertainties.
AU  - Meshreki, John
DA  - 2021
DO  - 10.25819/ubsi/10002
KW  - Standardmodell <Elementarteilchenphysik>
KW  - Experimental particle physics
KW  - Differential cross sections
KW  - Top photon
KW  - Unfolding
KW  - Top-quark pair production
LA  - eng
PY  - 2021
TI  - Differential cross-section measurements of the associated production of top quarks with a photon at 13 TeV with the ATLAS detector
TT  - Differentiale Wirkungsquerschnitte der assoziierten Produktion von Top-Quarks mit einem Photon bei 13 TeV mit dem ATLAS-Detektor
UR  - https://nbn-resolving.org/urn:nbn:de:hbz:467-19914
Y2  - 2024-11-22T06:03:06
ER  -