Pseudoscalar Higgs boson pair production in photon-photon collisions

The cross sections for the pseudoscalar Higgs boson pair production at the one-loop level in photon-photon collisions are calculated in the framework of the minimal supersymmetric standard model. We find that the cross sections of the process gamma gamma --> A(0)A(0), which do not strongly depend on the choices of the value of tan beta and photon-photon centre-of-mass system (CMS) energy root (s) over cap, are generally in the range 0.01 fb to 1 fb for root (s) over cap = 500, 1000 and 2000 GeV. The total cross sections for the process e(+)e(-) --> gamma gamma --> A(0)A(0) are less than 1 fb for mA(0) > 100 GeV and e(+)e(-) CMS energy root s = 500, 1000 and 2000 GeV. Thus, it is difficult to investigate the pseudoscalar Higgs boson pair production at the next linear collider (NLC).