Bottom quark pair production in yy collision''
关于光子对撞机上底夸克对产生的研究

We study the Yukawa corrections to the γγ→bb cross section in the topcolor assisted technicolor models at the photon photon colliders.We find that.for the favorable parameters,the relative corrections from pseudo-Goldstone bosom give out a 3.17%-5.90%decreinent of the cross section from the tree level when√s=500 GeV,the total relative COrrections are significantly larger than the corresponding corrections in the standard model,the general two Higgs doublet model and the minimal supersymmetfic standard model.So the observation of the correction to the γγ→bb process at the International Linear Colliders is certainly the clue to the standard model and new physics.