中性Top介子与轻子味破坏衰变过程  

Neutral Top-Pion and the Lepton Flavor Violation Processes

作　　者：岳崇兴[1] 于东麒[1] 

机构地区：[1]辽宁师范大学物理与电子技术学院,大连116029

出　　处：《高能物理与核物理》2005年第11期1027-1032,共6页High Energy Physics and Nuclear Physics

基　　金：国家自然科学基金(90203005);辽宁省自然科学基金(20032101)~~

摘　　要：在顶色辅助的人工色(TC2)模型框架下,研究了中性top介子π_t^0对轻子味破坏(LFV)过程l_i→l_jγ,l_i→l_Jl_kl_l和t→cl_il_j的贡献。考虑到当前μ→eγ过程的实验上限对TC2模型中自由参数的一些限制,进一步计算了top介子对过程l_i→l_jl_kl_l和t→cl_il_j分支比的量子修正。数值结果表明,在大部分参数空间内分支比的值可提高几个量级。top介子对某些过程的修正效应也许可被将来的实验观测到。In the context of topcolor-assisted techicolor （TC2） model, we study the contributions of the neutral toppion πt^0 to the lepton flavor violation （LFV） processes li→ljγ,li→ljlkll and t →clilj respectively. We find that the present experimental upper bound for μ→eγ gives severe constraints on the free parameters of the TC2 model. Under these constraints, we consider the processes li →ljlkll and t→cljlj generated by πt^0 exchange at the tree-level and the one loop level. Our numerical results show that the neutral top-pion πt^0 can enhance the branching ratios of these processes by several orders of magnitude. Some of those processes might be used to detect the possible signals of πt^0 in the futrue high energy experiment.

关 键 词：中性top介子(πt^0) 轻子味破坏(LFV) 分支比 中性Top介子 衰变过程 轻子 中性top介子 实验观测 TC2模型 模型框架 

分 类 号：O572.3[理学—粒子物理与原子核物理]