Spin Correlations In Tt Events From Pp Collisions

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    Spin Correlations in tt Events from pp Collisions
    Measured at √s = 7 TeV in the Lepton Jets Final State with the ATLAS Detector
    By: Boris Lemmer
    Publisher:
    Springer
    Print ISBN: 9783319189314, 331918931X
    eText ISBN: 9783319189321, 3319189328
    Copyright year: 2015
    Format: PDF
    Available from $ 109.00 USD
    SKU 9783319189321
    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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