强子对撞机上中性top-pion介子产生过程pp(p)→(П_t^0П_t^0),b(П_t^0)的研究  

Study of the Top-Pion Production Processes pp(p)→(П_t^0)(П_t^0),b(П_t^0) at the Hadron Colliders

作　　者：陈兰莉[1] 许文娜[1] 王学雷[1] 

机构地区：[1]河南师范大学物理与信息工程学院

出　　处：《高能物理与核物理》2007年第3期232-235,共4页High Energy Physics and Nuclear Physics

基　　金：国家自然科学基金(10375017)资助~~

摘　　要：在TC2模型框架下研究了强子对撞机Tevatron和LHC上中性top-pion介子Пt0的产生过程pp(p)→Пt0Пt0和pp(p)→bПt0．研究结果表明,在Tevatron上,这两个过程的产生截面都很小,通过这两个过程我们无法探测到中性top-pion介子．在LHC上,产生截面会大大增加,但通过Пt0Пt0的产生仍无法探测到中性top-pion介子．bПt0在LHC上的产生截面能达到几百个fb甚至pb的量级,LHC每年能产生104-105个bПt0事例．另外,味改变耦合Пt0tc的存在,使得实验能通过背景非常干净的衰变道Пt0→tc来探测Пt0．因此,通过bПt0这一产生机制,未来的LHC实验应能获得足够多的可鉴别的Пt0事例．我们的研究结果,可为LHC上寻找中性top-pions介子检验TC2模型提供有价值的理论指导．In the framework of the topcolor-assisted Technicolor（TC2） model, the neutral top-pion （∏0t） production →∏0t∏0t and pp（pp-） --∏0t , are studied. The results show processes at hadron colliders（Tevatron and LHC）, pp（pp-） ∏0t∏0t that the cross sections of these two processes at Tevatron are too small to observe ∏0t. The cross sections can be significantly enhanced at LHC, but ∏0t is also not observable via ∏0t∏0t production at LHC. The cross section of b∏0t production reaches the level of a few hundred fb even a few pb at LHC and 10^4-10^5 events can be produced each year. Furthermore, Due to the existence of the flavor-changing coupling ∏0ttc-, ∏0t can be experimentally detected via the decay mode ∏0t → tc- with the clean background. Therefore, the enough distinguished ∏0t events would be obtained via the b∏0t production at LHC future experiments. Our study can provide the valuable theoretical information for probing neutral top-pion and testing TC2 model at LHC.

关 键 词：TC2模型 电弱对称性破缺 强子对撞机 产生截面 

分 类 号：O572.3[理学—粒子物理与原子核物理]