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.
Highlights
Background rejectionBackground rejection versus Signal efficiency 1
In this paper we explore CP discrimination in the associated production of top-quark pairs with a generic scalar boson (φ) at the LHC
Following the decay of all intermediate massive particles, the signal final state is characterized by the presence of two oppositely charged leptons, two neutrinos and two bb quark pairs, at parton level
Summary
The most general Yukawa interaction of a boson (φ), with no definite value of CP, to a top quark pair can be written as. They are shown at parton level without any cuts. In order to study the CP-sensitivity as a function of the φ boson mass, forwardbackward asymmetries of some variables were computed for each CP-component of the top quark Yukawa coupling, i.e., CP-even and CP-odd. As hinted by the behaviour of the cross sections, for large enough Higgs masses, the difference between
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