In this thesis, the top quark mass and top quark pair differential cross section measurements are presented, based on data collected by the CMS detector at the LHC in 2011 and 2012. The mass of the top quark is measured using a sample of top-antitop candidate events with one electron and at least four jets in the final state, obtained from approximately 5.0 fb -1 of data at a centre of mass energy of Vs = 7 TeV. The top quark mass is extracted from a combined likelihood fit, and measured to be 172.87 ± 0.27 (stat.) ± 2.17 (syst.) GeV. The normalised differential cross section of top quark pair production is measured with respect to a number of event-level observables, including missing transverse energy, scalar sum of jet transverse momenta, scalar sum of total event transverse momenta, and leptonically decaying W boson transverse momentum and transverse mass. The analysis is performed for semileptonic top-antitop events, with either an electron or a muon, and at least four jets in the final state. Approximately 19.7 fb -1 of data at a centre of mass energy of Vs = 8 TeV are used. No significant deviations from the Standard Model predictions are observed.
| Identifer | oai:union.ndltd.org:bl.uk/oai:ethos.bl.uk:658205 |
| Date | January 2014 |
| Creators | Senkin, Sergey |
| Publisher | University of Bristol |
| Source Sets | Ethos UK |
| Detected Language | English |
| Type | Electronic Thesis or Dissertation |
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