ILC上e^+e^-对撞产生t^+t^-夸克对  

The production of t^+t^- quark pair through e^+e^- collider at ILC

作　　者：陈学文[1] 张家伟[1] 方祯云[2] 

机构地区：[1]重庆科技学院数理学院,重庆401331 [2]重庆大学物理系,重庆400030

出　　处：《原子与分子物理学报》2013年第3期416-420,共5页Journal of Atomic and Molecular Physics

基　　金：国家自然科学基金(11075224);重庆市自然科学基金(2008BB0298);重庆科技学院科研基金(CK2011B34)

摘　　要：本文结合国际直线对撞机(ILC)的实验讨论了e+e-湮灭产生t+t-对过程.在具体计算过程中,本文采用一种新的计算方式,即"混合链图传播子"修正下的反应截面,首先对QED中Dyson链图传播子理论在电弱统一标准模型(WS)中做了推广,获得WS中的光子、中间玻色子混合链图传播子,进而计算了γ,Z0混合链图修正下e+e-→t+t-反应总截面σchain,并与单圈修正下的总截面σloop和最低阶总截面σ0做了对比分析,发现在国际直线对撞机对撞能区,σchain对σloop和σ0的修正很大.此外,作者还结合国际直线对撞机的对撞亮度,讨论了每年可在ILC上产生t+t-对的事例数.In this paper we discussed the production of quark pair through the work of collider by means of the International Linear Collider （ILC）. A new method the mixed chain propagator correction was used to calculate the cross section of e＋ e-→ t＋ t-. Firstly we promoted the Dyson chain propagator theo- ry of QED to the electroweak unification standard model and acquired the mixing chain propagators of photon and intermediate gauge boson in standard model. Then we calculated the total cross section of e＋ e- →t＋ t- by the mixed chain propagator correction and compared it with the total cross sections by one loop correction δ^loop and tree level δ^0. The numerical results showed that the corrections of δ^chain to δ^loop and δ^0 are large. In addition, combined with the linear collider brightness we also discussed the number of t＋t- pairs that can be produced each year at ILC.

关 键 词：混合链图传播子 反应截面 e+e-对撞 标准模型 

分 类 号：O412.3[理学—理论物理] O413.3[理学—物理]