利用具有两个Higgs-doublets的扩展标准模型对LEP Ⅱ能量下t(?)产生过程的研究

The Study on the Production of tc at LEP-Ⅱ Energy in the Extended Standard Model with Two Higgs-doublets

在标准模型和两个Higgs二重态以及包括第四代费米子的扩充中计算了用正负电子对撞出t(?)(或(?)c),即e^+e^-→t(?)(or (?)c)产生截面。结果表明即使顶夸克质量如模型预言的有140 GeV左右,只要在此扩充中取最有利的参数时甚至在LEP Ⅱ中这一过程亦是可观测的。

In this paper the cross section of the production of tc(or tc) by e^+e^- collisoin, i, e. e^+e^-→tc(or tc), is computed in the Standard Model and its extension with two Higgs-doublets as well as the fourth generation fermions included. The results show that even for the top mass is so high around 140 GeV, as predicted by the Model, the cross section of this process still may be reach at an observable valne at the LEP-Ⅱ if favourable parameters are taken in the extension model.