SU(3)简易群模型和直线对撞机上顶夸克对产生的自旋修正(英文)

SU (3) Simple Group Model and Spin Correction of Top Quark Pair Production at Linear Colliders

在SU(3)简易群模型的框架下,研究了在直线对撞机上质心能量为800GeV时顶夸克对通过e^+e^-→t(?)过程产生的自旋修正.结果表明新的规范玻色子Z_H对t↑(?)↓态和t↓(?)↑态的产生截面能产生明显的修正;当1TeV≤M_(Z_H) 2TeV和cosθ<0时,相对修正参数的值R(t↑(?)↓)和R( t↓(?)↑)分别在18.16%～3.45%和47.6%～3.4%的范围.因而在大部分参数空间内,新的规范玻色子H_Z对顶夸克对产生的自旋修正影响应该可以在未来的高能直线对撞机上被观测到.

In the context of the SU（3） simple group model, we study the spin correction of the top quark pair production via the process e^＋ e^→tt at the high energy linear e^＋ e^- collider （ILC） with a centre-of-mass energy √S= 800 GeV. Our numerical results show that the gauge boson ZH exchange can generate significantly corrections to the differential cross sections for the t↑t↓, and t↓t↑ states. For 1TeV ≤ MzH≤ 2TeV and cos θ 〈 0, the values of the relative correction parameters R （t↑t↓） and R （t↓t↑） are in the ranges of 18.16%-3.45% and 47.6%-3.4%, respectively. Thus, in most of the parameter space, the effects of the new gauge boson ZH on the spin configurations of the top quark pair production might be observed at the future ILC experiments.