Abstract
In this paper we explore CP discrimination in the associated production of top-quark pairs ( toverline{t} ) with a generic scalar boson (\U0001d719) at the LHC. We probe the CP-sensitivity of several observables for a varying scalar boson mass and CP-number, either CP-even (\U0001d719 = H ) or CP-odd (\U0001d719 = A), using dileptonic final states of the toverline{t}phi system, with \U0001d719 → boverline{b} . We show that CP-searches are virtually impossible for \U0001d719 boson masses above a few hundred GeV in this channel. A full phenomenological analysis was performed, using Standard Model background and signal events generated with MadGraph5_aMC@NLO and reconstructed using a kinematic fit. The most sensitive CP-observables are used to compute Confidence Levels (CLs), as a function of luminosity, for the exclusion of different signal hypotheses with scalar and pseudoscalar boson masses that range from m\U0001d719 = 40 GeV up to 200 GeV. We finalize by analysing the impact of a measurement (or limit) of the CP-violating angle in the parameter space of a complex two-Higgs doublet model known as the C2HDM.
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