![]() ![]() ![]() Both measurements select top-antitop quark events with an opposite-sign electron-muon pair and one or two b-tagged jets in the final state.Ī study is first presented of the jet activity arising from quark and gluon radiation produced in association with top quark pairs, in events with an opposite-sign electron-muon pair as well as at least two b-tagged jets in the final state. This thesis presents two measurements of top quark pair production events collected with the ATLAS Detector at the CERN Large Hadron Collider (LHC) in proton-proton collisions at a center-of-mass energy 7-8 TeV. Studies of the top quark are probes of new physics, essential tools to understand the Higgs boson, and valuable tests of the Standard Model. The characteristics of the top quark, such as its high mass-close to the scale of electroweak symmetry breaking-and its dominance in the running of the recently discovered Higgs boson’s self-coupling, make the top quark a cornerstone of current research. As heavy as an atom of gold but much smaller than a proton, the top quark is the most massive fundamental particle known in the universe and an integral part of current particle physics research. ![]()
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