顶色辅助的人工色模型下顶夸克极化效应的研究(英文)

Probing Top Quark Polarization Effects in Topcolor-Assisted Technicolor Model

在顶色辅助的人工色(TC2)理论下,在强子对撞机上研究了顶夸克-反顶夸克对的产生过程中顶夸克的极化效应,在计算过程中,运用了MRS set A’部分子分布函数和螺旋度投影算符的方法.研究结果表明:在Tevatron上顶夸克的极化效应太小不可探测;参数选取得当,该效应在LHC上可以探测到,其值可达16%.因此,顶夸克的极化效应提供了一种切实可行的检验顶色辅助的人工色模型的方法.

We study the polarization effects of the top-quark on the tt production cross sections at hadron colliders in the topcolor-assisted technicolor model . The MRS set A＇ parton distributions and the helicity projection operators methods are used in the calculation. It is shown that the polarization effects of the top quark are too small to produce enough identified signals at the Tevatron while they can be large enough to be detected at the LHC with reasonable values of the parameters. The polarization effects at the LHC can reach 16%, therefore, they provide feasible tests of the topcolor-assisted technicolor model.