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 Title: Measurement of top-antitop differential cross sections in the di-lepton channel with ATLAS in p-p collisions at 7TeV Author(s): Lie, Ki Director of Research: Errede, Steven M. Doctoral Committee Chair(s): Liss, Tony M. Doctoral Committee Member(s): Willenbrock, Scott S.; Yang, Liang Department / Program: Physics Discipline: Physics Degree Granting Institution: University of Illinois at Urbana-Champaign Degree: Ph.D. Genre: Dissertation Subject(s): Large Hadron Collider (LHC) A Toroidal LHC Apparatus (ATLAS) top Abstract: This dissertation presents a measurement of differential cross sections as a function of mass, transverse momentum and rapidity of the top quark pairs using $\sqrt{s} = 7 \TeV$ proton-proton collision data collected by the ATLAS detector at the Large Hadron Collider. This data corresponds to an integrated luminosity of \lumitot. Events with top quark pair signatures are selected in the di-lepton channel. The reconstructed differential distributions are subtracted with estimated backgrounds and are corrected for detector response and acceptance to the top parton level. The measured differential cross sections are compared with different Monte Carlo generators of top quark pair production. The results are consistent with the Standard Model predictions and with the differential cross section results measured in the lepton+jets channel. Issue Date: 2015-04-16 Type: Thesis URI: http://hdl.handle.net/2142/78395 Rights Information: Copyright 2015 Ki Lie Date Available in IDEALS: 2015-07-22 Date Deposited: May 2015
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