Top-antitop cross section measurement as a function of the jet multiplicity in the final state and beyond the Standard Model top-antitop resonances search at the ATLAS detector at CERN

Ferreira de Lima, Danilo Enoque (2014) Top-antitop cross section measurement as a function of the jet multiplicity in the final state and beyond the Standard Model top-antitop resonances search at the ATLAS detector at CERN. PhD thesis, University of Glasgow.

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Abstract

The top quark is the heaviest particle in the Standard Model, with a strong coupling to the Higgs boson. It is often seen as a window to new physics, therefore understanding its production is a key ingredient for testing the Standard Model or physics Beyond the Standard Model. In this document, the production cross section of top-antitop pairs in its semileptonic decay channel is measured as a function of the jet multiplicity in the ATLAS experiment, using proton-proton collisions at the center-of-mass energy of sqrt(s) = 7 TeV. The top-antitop production with extra jets is the main background for many analyses, including the top-antitop-Higgs production studies. The analysis performed is extended in a search for Beyond the Standard Model physics which predicts a resonance decaying in a top-antitop pair, using ATLAS data at center-of-mass energy of sqrt(s) = 7 TeV. The latter analysis is repeated for ATLAS data collected with sqrt(s) = 8 TeV. Performance studies of b-tagging algorithms in the ATLAS Trigger System are also presented.

Item Type: Thesis (PhD)
Qualification Level: Doctoral
Keywords: physics, particle physics, top quark, measurement, search, Beyond the Standard Model, topcolor, Kaluza-Klein gluons, Standard Model, unfolding, ATLAS, CERN
Subjects: Q Science > QC Physics
Colleges/Schools: College of Science and Engineering > School of Physics and Astronomy
Funder's Name: UNSPECIFIED
Supervisor's Name: Buttar, Professor Craig and Doyle, Professor Anthony
Date of Award: 2014
Depositing User: Danilo Enoque Ferreira de Lima
Unique ID: glathesis:2014-5015
Copyright: Copyright of this thesis is held by the author.
Date Deposited: 13 Mar 2014 15:54
Last Modified: 13 Mar 2014 15:56
URI: http://theses.gla.ac.uk/id/eprint/5015

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