TC2模型下中性top-pion衰变过程研究

Study on the Single Neutral Top-pion Decay Processes in TC2 Theory

在顶色辅助的人工色(TC2)理论模型中,研究了树图下中性top-pion(πt0)的衰变过程π0t→b-b,t-t,t-c和圈图下中性top-pion(π0t)的衰变过程π0t→gg,γγ,γz,通过对这些衰变过程的衰变分支比的计算,可以得到πt0在树图下的主要衰变过程为π0t→t-t,t-c,在圈图下的主要衰变过程为π0t→gg.对于小质量的中性top-pion(πt0),可以用πt0→t-c来探测;对于大质量的中性top-pion(π0t),可以用π0t→t-t来探测.中性top-pion(π0t)是TC2模型中的特征粒子,通过对这些过程的研究可为在将来的直线对撞机上探测top-pion(π0t)的存在提供理论依据,以此来检验TC2理论的正确性.

In the framework of top-color assisted Technicolor （TC2） theory, we study the decay processes πt^0→bb^-,tt^-,tc^- and the decay processes of neutral top-pion at the loop of neutral top-pion at the tree level πt^0→gg,γγ,γz. The study shows that the main decay channels of neutral top-pion are the tree level mode： πt^0→tt^-,tc^- and the loop level mode： gg . When the mass of top-pion （πt^0） is small, we can use the πt^0→tc^- to detect it ; when the mass of top-pion （ πt^0） is large, we can use the πt^0→tt^- to detect it. The top-pion is the characteristic particle of TC2 theory, so the study provides us with the useful informations to search for neutral top-pion which can prove the correction of TC2 theory.