摘要
研究τ轻子味破缺衰变,有助于探索超出标准模型的具有轻子味破缺(LFV)机制的新物理.在代非普适Z′模型中,对τ^-→μ^-(e^-)KK衰变进行了研究,考虑了共振和非共振的贡献以及来自B介子衰变的限制,结果表明:在现有的参数范围内,这些衰变的分支比都能达到目前的实验上限.最新的实验上限将模型参数B_(τμ(τe))^(L(R))限制在O(10^(-3)).其中,s夸克末态的贡献远大于u(d)夸克末态的贡献,共振部分形状因子的贡献最大.分析了τ^-→μ^-(e^-)KK微分衰变率与双K介子不变质量s^(1/2)(s=m^2KK)的关系.在双K介子不变质量范围内,矢量介子φ(1020)共振占主要地位,τ^-→μ^-KK衰变的共振峰比τ^-→e^-KK衰变的共振峰高.
It is helpful to investigate theτdecays to explore new physics scenarios with lepton flavor violation(LFV)beyond the SM.We investigateτ-→μ-(e-)KKdecays in family non-universal Z′model.Considering the resonant and non-resonant terms contributions and the constraints from B mesons decays,we get the results that,in the current parameters scope,Br(τ-→μ-(e-)KK)could reach the experimental upper limits.The contributions of s quark in final states is higher than those of the u/d quark in final states.We also get the constraints of parameter|B_(μτ(eτ))(L/R)|at the order of O(10(-3))from experimental data.The invariant mass distributions of di-kaon are analyzed.The contribution of resonant form factor F_sR is the most one among those of form factors.And the φ(1020)vector resonance is dominant in the scope of di-kaon invariant mass.
出处
《河南师范大学学报(自然科学版)》
CAS
北大核心
2016年第2期40-44,共5页
Journal of Henan Normal University(Natural Science Edition)
基金
国家自然科学基金(11005033
11405046)
河南省教育厅自然科学研究计划资助项目(2011A140012)
关键词
代非普适Z′模型
轻子味破缺
分支比
不变质量分布
family non-universal Z′model
lepton flavor violation
branching ratios
invariant mass distribution