通过味改变过程探测TC2理论中的中性toppion介子  

Searching for Neutral Toppion in TC2 Model via a Flavor-Changing Process

作　　者：张晋宇[1] 万陵德[1] 王学雷[1] 杨悦玲[1] 李炳中[1] 

机构地区：[1]河南师范大学物理与信息工程学院,新乡453002

出　　处：《高能物理与核物理》2002年第12期1209-1213,共5页High Energy Physics and Nuclear Physics

基　　金：国家自然科学基金 (1 0 1 75 0 1 7);河南省科委杰出青年基金 (2 1 0 4);河南省高校杰出科研人才创新工程(2 0 0 2KYCX0 0 9)资助~~

摘　　要：在Topcolor辅助的Technicolor(TC2 )模型下 ,研究了一个产生中性toppion介子 (Π0t)的味改变过程 :e+e- →tcΠ0t.研究结果表明 ,在TESLA对撞机上 ,当质心能量高时 ,在大多数参数区间 ,e+e- →tcΠ0t 的产生截面可达到 0 .1fb量级 ,每年可有数十个Π0t 介子事例产生 .当Π0t 质量较小时 ,由于共振效应 ,产生截面可达几个fb .由于背景干净 ,有可能在TESLA对撞机上探测到Π0t 介子事例 .另一方面 ,研究发现 ,可以在实验中清晰地探测到toppion charm不变质量分布中的共振峰 .因此 ,Π0t 介子的产生过程e+e- →tcΠ0t 为人们提供了一个极好的机会 ,来探测中性Π0t 介子 ,从而检验TC2模型 .We study a flavor-changing toppion production process e+e-→t?c?Π0 t in the topcolorassisted technicolor(TC2) model. The studies show that, with high centre of mass energy in TESLA collider, the production cross section of e+e-→t?c?Π0 t is about 0.1 fb in most parameter regions of TC2 model and a few tens events of toppion can be produced each year. The resonance effect can enhance the cross section to a few fb when toppion mass is small. With clean background, the toppion events can possibly be detected at TESLA collider. On the other hand, we find that there exists a narrow peak in the toppion-charm invariant mass distribution which could be clearly detected. Therefore, the toppion production process e+e-→t?c?Π0 t provides a unique chance to detect toppion events and test the TC2 model. =

关 键 词：味改变过程 人工色模型 顶色辅助 中性toppion介子 电弱对称性破缺 高能物理 对撞机 TC2模型 粒子探测 

分 类 号：O572.24[理学—粒子物理与原子核物理]