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Area of Science:

  • High Energy Physics
  • Particle Physics
  • Beyond Standard Model Physics

Background:

  • Extended Higgs models predict heavy Higgs states with potential CP-violating properties.
  • Probing the CP nature of Higgs bosons is crucial for understanding fundamental physics.
  • Existing methods may not fully distinguish between CP-even and CP-odd components of heavy Higgs states.

Purpose of the Study:

  • To propose a novel method for probing CP-violation in the heavy (pseudo)scalar sector of an extended Higgs model.
  • To simultaneously utilize Higgs-vector boson (HVV) and Higgs-top quark (Htt-bar) interactions of a heavy Higgs state (H).
  • To confirm CP-violation by discovering both CP-even and CP-odd components of the heavy Higgs state.

Main Methods:

  • Simultaneous use of HVV and Htt-bar interactions for a heavy Higgs state.
  • Probing CP-even component via tree-level HVV interaction.
  • Probing CP-odd component by analyzing the tt-bar pair as a 1S0 state.
  • Exploiting Higgs production via vector-boson fusion (VBF) at the Compact Linear Collider (CLIC).
  • Analyzing the azimuthal angle distribution of leptons from top and antitop quark decays.

Main Results:

  • The proposed method allows for the simultaneous probing of CP-even and CP-odd components of a heavy Higgs state.
  • CP-violation can be confirmed if both components are discovered.
  • The Compact Linear Collider (CLIC) is identified as a suitable facility for this investigation.
  • Analysis of azimuthal angle distributions effectively disentangles the CP nature of the heavy Higgs state.
  • The method's implications for CP-violating two-Higgs-doublet models (2HDM) are demonstrated.

Conclusions:

  • The proposed method provides a viable strategy to detect CP-violation in heavy Higgs sectors.
  • Simultaneous observation of CP-even and CP-odd contributions is a key signature for CP-violation.
  • The Compact Linear Collider (CLIC) offers the necessary environment and analysis tools to implement this method.
  • This research contributes to a deeper understanding of Higgs physics beyond the Standard Model.