The top quark is the most massive fundamental particle of the Standard Model of particle physics and being the only quark which decays before hadronization gives a unique opportunity for studying Quantum Chromodynamics (QCD). This dissertation presents a measurement of differential cross-sections of top quark pairs decaying in a purely leptonic mode as a function of the dilepton invariant mass, transverse momentum, difference in the pseudorapidity and azimuthal angle between two leptons in the same event at 8 TeV proton-proton collision data collected by the ATLAS detector at the Large Hadron Collider. This data corresponds to an integrated luminosity of 20.3 fb−1. Events with top quark pair signatures are selected in the dilepton channel in the ATLAS acceptance (two leptons with pT < 25 GeV and |η| > 2.5). The measured cross-sections are compared to the Standard Model predictions generated using current Monte Carlo generators. All the measurements are found to be in agreement with the SM.
| Identifer | oai:union.ndltd.org:bl.uk/oai:ethos.bl.uk:739248 |
| Date | January 2018 |
| Creators | Gul, Umar |
| Publisher | University of Glasgow |
| Source Sets | Ethos UK |
| Detected Language | English |
| Type | Electronic Thesis or Dissertation |
| Source | http://theses.gla.ac.uk/8858/ |
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