Spin Correlations in tt Events from pp Collisions

Beschreibung

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.
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.
Winner of the Dr. Berliner and Dr. Ungewitter Prize of the University of Göttingen The ideal introduction for students starting to work on top quark analyses Introduces readers to the ATLAS detector and analysis objects Presents a detailed overview of top quark properties and reconstruction algorithms Includes supplementary material: sn.pub/extras

Autor*in

Boris Lemmer

Themen in »Spin Correlations in tt Events from pp Collisions«

Beyond standard model physics Down-type quark reconstruction Kinematic likelihood fit Reconstruction algorithms Top quark polarization Top/anti-top events Top/anti-top spin correlation l + jet decay mode

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