Topcolor-assisted Technicolor模型对Top夸克对产生树图贡献的研究

Study the tree-level contribution of the topcolor-assisted technicolor model to the top quark pairs production

在强子对撞机上研究了顶色辅助的人工色模型对顶夸克对产生的树图贡献,在计算过程中,运用了CTEQ5部分子分布函数的方法.研究结果表明:对于质量较轻的top-pion,在Tevatron上树图贡献较大,而在LHC上,在顶色辅助的人工色模型的绝大部分参数空间内,树图贡献均占较大比重.因此,为了使理论预言更可靠,在顶色辅助的人工色模型下计算顶夸克对的截面时,应考虑包括树图贡献在内的所有主要贡献.

This paper study the contribution of the TC2 model to the top quark pairs production in tree-level at hadron colliders, The CTEQ5 patton distributions method is used in the calculation. It is shown that the tree -level contribution is significant for the light top - pion at the Tevatron while it can make a more significant contribution to the cross section in most parameter spaces of the TC2 model at the LHC. Therefore, in order to make theoretical prediction more credible, one should consider all the major contributions including the tree - level sector in calcu- lating top quark pairs cross section in TC2 model.