Differential top pair production cross-section measurements at √s = 7 TeV with the ATLAS detector at the LHC

Diplôme Thèse Differential top pair production cross-section measurements at √s = 7 TeV with the ATLAS detector at the LHC eng 2014-07-16 author Watson Ian 738972 director Clark Allan Geoffrey 24043 10.13097/archive-ouverte/unige:40209 urn:nbn:ch:unige-402090 Sc. 4697 The top quark is the most massive fundamental particle of the Standard Model of particle physics, and as the only quark to decay before hadronising gives a unique opportunity for studying QCD, the theory of the strong interaction. In this thesis, we study the tt production cross-section as a function of several variables related to the produced top quarks. This thesis presents variables defined after the hadronisation of the top quark, and so are mostly independent of its theoretical description, unlike previous results which are corrected to the partonic variables. Using the ATLAS detector at the LHC, the measurements are performed for √s = 7 TeV proton–proton collisions. The measurements are sensitive to various parameters entering the description of top quark production, including the Parton Distribution Functions, and so have good potential to be used in furthering our understanding of proton collision physics and for future tunings of the models used in describing the physics. Dewey 500.2 34 Département de physique nucléaire et corpusculaire 132 false 56b4fa58-800d-4f20-b510-a16608b2ba5b Thesis Public ijwatson-unige-thesis.pdf 8863437 application/pdf openAccess Faculté des sciences / Section de physique / Département de physique nucléaire et corpusculaire

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Differential top pair production cross-section measurements at √s = 7 TeV with the ATLAS detector at the LHC				2014	866	262

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Watson, Ian