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Advisor(s)
Abstract(s)
In this paper we explore CP discrimination in the associated production of top-quark pairs (t (t) over bar) with a generic scalar boson (phi) at the LHC. We probe the CP-sensitivity of several observables for a varying scalar boson mass and CP-number, either CP-even (phi = H) or CP-odd (phi= A), using dileptonic final states of the t (t) over bar phi system, with phi -> (b) over bar. We show that CP-searches are virtually impossible for phi 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(phi) = 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.
Description
Keywords
Beyond Standard Model CP violation
Citation
AZEVEDO, Duarte; [et al] – Scalar mass dependence of angular variables in t(t)over-bar phi production. Journal of High Energy Physics. ISSN 1029-8479. Vol. 2020, N.º 6 (2020), pp. 1-31