| Summary: | This thesis presents a collection of studies considering Z' physics in the tt¯ final state at the Large Hadron Collider (LHC), focusing largely on its charge and spin asymmetry observables. The analyses employ parton level simulations in the presence of the tree-level backgrounds and realistic reconstruction efficiency estimates. A number of extra U (1) models are studied, including various common benchmark models currently considered at the LHC as well as models more suited to tt¯ searches from composite Higgs scenarios and extra dimensions. The studies address the ability of tt¯, with its asymmetries, to distinguish models from the Standard Model background and one another, both on its own and as a complementary channel to other, more traditional final states with the view to a complete characterisation of the Z' couplings. Scenarios with two quasi-degenerate resonances are also considered where tt¯ asymmetries can identify their presence when cross section observables cannot resolve the two peaks.
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