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Spin Correlations in tt Events from pp Collisions electronic resource Measured at √s = 7 TeV in the Lepton+Jets Final State with the ATLAS Detector / by Boris Lemmer.

By: Lemmer, Boris [author.]Contributor(s): SpringerLink (Online service)Material type: TextTextSeries: Springer Theses, Recognizing Outstanding Ph.D. ResearchPublication details: Cham : Springer International Publishing : Imprint: Springer, 2015Description: XXIV, 233 p. 112 illus., 9 illus. in color. online resourceContent type: text Media type: computer Carrier type: online resourceISBN: 9783319189321Subject(s): physics | Quantum field theory | String theory | Elementary particles (Physics) | Physical measurements | Measurement | Physics | Elementary Particles, Quantum Field Theory | Quantum Field Theories, String Theory | Measurement Science and InstrumentationDDC classification: 539.72 LOC classification: QC793-793.5QC174.45-174.52Online resources: Click here to access online
Contents:
Standard Model, Top Quarks and Spin Correlation -- Experimental Setup -- Analysis Objects -- Dataset, Signal and Background Modelling -- Event Selection and Reconstruction -- Analysis Strategy -- Systematic Uncertainties -- Results -- Summary, Conclusion and Outlook.
In: Springer eBooksSummary: This thesis introduces readers to the Standard Model, the top quark and its properties, before explaining the concept of spin correlation measurement. The first measurement of top quark spin correlations at the LHC in the lepton+jets decay channel is presented. As the heaviest elementary particle, the top quark plays an essential role in the Standard Model of elementary particle physics. In the case of top quarks being produced in pairs at hadron colliders, the Standard Model predicts their spins to be correlated. The degree of correlation depends on both the production mechanism and properties of the top quark. Any deviation from the Standard Model prediction can be an indicator for new physics phenomena. The thesis employs an advanced top quark reconstruction algorithm including dedicated identification of the up- and down-type quarks from the W boson decay.
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Standard Model, Top Quarks and Spin Correlation -- Experimental Setup -- Analysis Objects -- Dataset, Signal and Background Modelling -- Event Selection and Reconstruction -- Analysis Strategy -- Systematic Uncertainties -- Results -- Summary, Conclusion and Outlook.

This thesis introduces readers to the Standard Model, the top quark and its properties, before explaining the concept of spin correlation measurement. The first measurement of top quark spin correlations at the LHC in the lepton+jets decay channel is presented. As the heaviest elementary particle, the top quark plays an essential role in the Standard Model of elementary particle physics. In the case of top quarks being produced in pairs at hadron colliders, the Standard Model predicts their spins to be correlated. The degree of correlation depends on both the production mechanism and properties of the top quark. Any deviation from the Standard Model prediction can be an indicator for new physics phenomena. The thesis employs an advanced top quark reconstruction algorithm including dedicated identification of the up- and down-type quarks from the W boson decay.

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