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MEASUREMENT OF BOOSTED DIFFERENTIAL TOP QUARK PAIR PRODUCTION CROSS SECTION AT 13 TEV WITH THE CMS DETECTOR

Author
Dittmer, Susan J.
Abstract
This thesis describes a measurement of the differential top quark pair production cross section for top quarks with high transverse momentum (pt) in proton-proton collisions at a center-of-mass energy of 13 TeV. The measurement is performed using data collected by the CMS experiment during the 2016 data-taking period, corresponding to an integrated luminosity of 35.9 fb-1. The measurement is performed using events where one top quark decays hadronically and is reconstructed as a single large-radius t jet with pt > 400 GeV, while the other top quark decays leptonically to a b jet, an electron or a muon, and a neutrino. Jet substructure techniques are used to identify the large-radius jet as a t jet candidate. The measurement demonstrates that current simulations overpredict the rate of top quark pair production at high pt, providing valuable feedback on the accuracy of current simulation.
Date Issued
2017-12-30Subject
boosted; Particle physics; top quark; CMS; LHC; cross section; semileptonic
Committee Chair
Thom-Levy, Julia
Committee Member
Perelstein, Maxim; Wittich, Peter
Degree Discipline
Physics
Degree Name
Ph. D., Physics
Degree Level
Doctor of Philosophy
Type
dissertation or thesis