Abstract
In the context of topcolor-assisted technicolor (TC2) models, we calculate the s-channel contributions of the top-Higgs to the process . We find that, for reasonable ranges of the parameters, can give significant contributions to this process. When the top-Higgs mass approximately equals to the center-of-mass energy and the free parameter , the cross section can reach 161 fb, which may be detected in the γγ collisions based on the future e+e− colliders. Thus, the process may be used to probe the top-Higgs and further test TC2 models in γγ collisions.
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