Spin Correlations in tt Events from pp Collisions

Measured at √s = 7 TeV in the Lepton+Jets Final State with the ATLAS Detector

Nonfiction, Science & Nature, Science, Physics, Nuclear Physics, Quantum Theory
Cover of the book Spin Correlations in tt Events from pp Collisions by Boris Lemmer, Springer International Publishing
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Author: Boris Lemmer ISBN: 9783319189321
Publisher: Springer International Publishing Publication: June 24, 2015
Imprint: Springer Language: English
Author: Boris Lemmer
ISBN: 9783319189321
Publisher: Springer International Publishing
Publication: June 24, 2015
Imprint: Springer
Language: English

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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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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