Eri Asakawa

Measuring the Higgs CP property through top quark pair production at photon linear colliders

We present a model-independent study of the effects of a neutral Higgs boson without definite CP-parity in the process

Production of scalar Higgs and pseudoscalar Higgs in multi-Higgs doublet models at \(\gamma\gamma\) colliders

\gamma\gamma \to t\bar{t}

Probing the MSSM Higgs boson sector with explicit CP violation through third generation fermion pair production at muon colliders

around the mass pole of the Higgs boson. Near the resonance pole, the interference between the Higgs-exchange and the continuum amplitudes can be sizable if the photon beams are polarized and helicities of the top and anti-top quarks are measured. Study of these interference effects enables one to determine the CP property of the Higgs boson completely. An example of the complete determination is demonstrated in the context of the minimal supersymmetric standard model.

Contributions of vector-like quarks to radiative B meson decay

Abstract. We present the effects of heavy CP-even (H) and CP-odd (A) Higgs bosons on the production cross section of the process

Production of CP even and CP odd Higgs bosons at muon colliders

\gamma\gamma

Potential for measuring the H^\pm W^\mp Z^0 vertex from WZ fusion at the Large Hadron Collider

\rightarrow t\overline{t}

Measuring the Higgs CP property at a photon linear collider

at the energy around the mass poles of the Higgs bosons. It is found that interference between H and A with small mass gap, as well as the ones between Higgs bosons and continuum, contributes to the cross section, if the photon beams are polarized and if we observe the helicity of the top quarks. It is demonstrated in the framework of the minimal supersymmetric extension of the standard model that the H and A contributions can be sizable at future

CP-odd WWZ couplings induced by vector-like quarks

\gamma\gamma

Potential for measuring theH±W∓Z0vertex fromWZfusion at the CERN Large Hadron Collider

colliders for small values of