2020 Impact factor 4.590
Particles and Fields
Eur. Phys. J. C 14, 335-345
DOI 10.1007/s100520000347

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

Eri Asakawa1 - Jun-ichi Kamoshita2 - Akio Sugamoto2 - Isamu Watanabe3

1 Graduate School of Humanities and Sciences, Ochanomizu University, 1-1 Otsuka 2-chome, Bunkyo, Tokyo 112-8610, Japan
2 Department of Physics, Ochanomizu University, 1-1 Otsuka 2-chome, Bunkyo, Tokyo 112-8610, Japan
3 Akita Keizaihoka University Junior College, 46-1 Morisawa, Sakura, Shimokita-te, Akita 010-8515, Japan

Received: 16 December 1999 / Revised version: 30 January 2000 /
Published online: 6 April 2000 - © Springer-Verlag 2000

We present the effects of heavy CP-even (H) and CP-odd (A) Higgs bosons on the production cross section of the process $\gamma\gamma$ $\rightarrow t\overline{t}$ 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 $\gamma\gamma$ colliders for small values of $\tan\beta$. The methods to measure the CP-parity of the Higgs boson are also presented. The statistical significance of detecting the Higgs signals and measuring the Higgs CP-parity is evaluated.

Copyright Società Italiana di Fisica, Springer-Verlag 2000