Measurement of the fiducial differential cross-section of top quark pair production in the dilepton final state at 8 TeV

Gul, Umar (2018) Measurement of the fiducial differential cross-section of top quark pair production in the dilepton final state at 8 TeV. PhD thesis, University of Glasgow.

Abstract

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.

• Item Type: Thesis (PhD)
• Qualification Level: Doctoral
• Keywords: Fiducial differential cross-section.
• Subjects: Q Science > QC Physics
• Colleges/Schools: College of Science and Engineering > School of Physics and Astronomy
• Supervisor's Name: Buttar, Professor Craig
• Date of Award: 2018
• Depositing User: Umar Gul
• Unique ID: glathesis:2018-8858
• Copyright: Copyright of this thesis is held by the author.
• Date Deposited: 12 Mar 2018 14:29
• Last Modified: 24 Apr 2018 12:59
• URI: https://theses.gla.ac.uk/id/eprint/8858