【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 .更多还原

【Abstract】 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. =更多还原