Production of Scalar Higgs and Pseudoscalar Higgs in Multi-Higgs Doublet Models at $\gamma\gamma$ Colliders

摘要

We present the effects of heavy CP-even (H) and CP-odd (A) Higgs bosons onthe production cross section of the process $\gamma\gamma$ $\to t\bar{t}$ atthe energy around the mass poles of the Higgs bosons. It is found that theinterference between H and A with the small mass gap, as well as the onesbetween Higgs bosons and the continuum, contributes to the cross section, ifthe photon beams are polarized and if we observe the helicity of the topquarks. It is demonstrated in the framework of the minimal supersymmetricextension of the standard model that the H and A contributions can be sizableat future $\gamma\gamma$ colliders for small value of $\tan\beta$. The methodsto measure the CP-parity of the Higgs boson are also presented. The statisticalsignificances of detecting the Higgs signals and measuring the Higgs CP-parityare evaluated.