摘要
Eur. Phys. J. C 85 (2025) 6, 700 We propose to probe CP-violation in the heavy (pseudo)scalar sector of an extended Higgs model, in which we make simultaneous use of theHVV( V=W^(±), Z ) andHtt̄interactions of a heavy Higgs stateH . The CP-even component ofHcan be probed through the tree levelHVVinteraction while the CP-odd component ofHcan be probed if the finaltt̄pair can be tested to form a¹S₀state. We can then confirm CP-violation if both CP-even and CP-odd components ofHare discovered. This is possible at the Compact Linear Collider (CLIC) by exploitingHproduction from Vector-Boson Fusion (VBF) and decay tott̄pairs. We analyze the distribution of the azimuthal angle between the leptons coming from top and antitop quarks, that would allow one to disentangle the CP nature of such a heavy Higgs state. We also show its implications for the 2-Higgs-Doublet Model (2HDM) with CP-violation.