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

TL;DR

This paper investigates how heavy Higgs bosons influence top quark pair production in gamma-gamma collisions, highlighting interference effects, polarization dependence, and methods to determine Higgs CP-parity at future colliders.

Contribution

It introduces a detailed analysis of heavy Higgs effects on gamma-gamma to top pair production, including interference phenomena and CP-parity measurement techniques within the MSSM framework.

Findings

Interference between H and A affects cross sections near mass poles.

Polarized photon beams and top helicity observations enhance CP-parity detection.

H and A contributions can be significant at future gamma-gamma colliders for small tanβ.

Abstract

We present the effects of heavy CP-even (H) and CP-odd (A) Higgs bosons on the production cross section of the process $\gamma\gamma$ $\to t\bar{t}$ at the energy around the mass poles of the Higgs bosons. It is found that the interference between H and A with the small mass gap, as well as the ones between Higgs bosons and the 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 $\gamma\gamma$ colliders for small value of $\tan\beta$. The methods to measure the CP-parity of the Higgs boson are also presented. The statistical significances of detecting the Higgs signals and measuring the Higgs CP-parity are evaluated.