直线对撞机上中性top-pion介子产生过程的研究  

Study on the process of neutral top-pion production at linear collider

作　　者：王晓雪[1] 李卫彬[1] 赵军良[2] 王学雷[3] 

机构地区：[1]河南理工大学物理化学学院,河南焦作454000 [2]河南理工大学国有资产管理处,河南焦作454000 [3]河南师范大学物理与信息工程学院,河南新乡453007

出　　处：《河南理工大学学报（自然科学版）》2008年第6期730-734,共5页Journal of Henan Polytechnic University（Natural Science）

基　　金：国家自然科学基金资助项目(10375017);河南理工大学青年基金资助项目(614649)

摘　　要：为寻找新物理存在的可能性,在顶色辅助的人工色TC2理论模型下,研究了直线对撞机(ILC)上中性top-pion介子的产生机制.计算了γγ→t0这个过程的产生截面,结果显示.在所有中性top-pion产生过程中,γγ→0t的产生截面最大,其产生截面可以达到101—102fb量级.最后讨论了ILC上t0的各种衰变方式,由于树级味改变耦合t0t-c的存在,γγ→0t→t-c过程能够产生足够多的信号,并且由于背景干净,成为ILC上探测中性top-pion存在的最佳衰变道,这将为搜寻中性top-pion介子和检验TC2模型的正确性提供重要的理论依据.In order to search for the possibility of the new physics existence, and in the framework of the top- color - assisted technicolor model, a single neutral top - pion production process γγ→Ⅱt^0 via photon collision at the ILC is studied. The cross section of the process is calculated. The result shows that, among the various production processes at the ILC, the cross section of γγ→Ⅱt^0 is the largest which may reach the level of 10^1 - 10^2 fb. Finally, the potential to observe the neutral top- pion via its various decay modes at the ILC is discussed. Due to the existence of coupling Ⅱt^0 tc^-, which is changed by the tree - lever flavor, γγ→Ⅱt^0→tc^- can provide enough number of typical signals to identify the neutral top - pion with the clean SM background. Therefore, the process γγ→Ⅱt^0 plays an important theoretical role in searching for the neutral top - pion and testing the TC2 model.

关 键 词：标准模型 人工色理论 中性top—pion介子 产生截面 

分 类 号：O572.2[理学—粒子物理与原子核物理]