Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1999-12-16
Eur.Phys.J.C14:335-345,2000
Physics
High Energy Physics
High Energy Physics - Phenomenology
23 pages, LATEX file with 8 PS figures, to be published in Eur.Phys.J.C
Scientific paper
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.
Asakawa Eri
Kamoshita Jun-ichi
Sugamoto Akio
Watanabe Isamu
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