论文标题
$τ^ - \rightarrowπ^ - ν_τγ$的现象学使用lcsr
Phenomenology of $τ^- \rightarrow π^- ν_τ γ$ using LCSR
论文作者
论文摘要
我们介绍了辐射tau衰减的研究（$τ^ - \rightarrowπ^ - ν_τγ$），使用光锥总和规则计算结构依赖的贡献。该衰减包括与辐射式倾斜衰减相同的形式因素，其质量转移平方（$ t $）之间的关键差异是正面的$ t $，这使得这些形式的形式使这些形式呈序列，并且作为$ t $现在可以将值提高到$m_τ^2 $，它可以产生真实的hadronic共鸣。这些形式的分析形式已经使用光锥总和法和$π-γ$系统中的质谱和衰减宽度计算。结构依赖参数$γ$，轴向与矢量形式的比率与实验确定非常吻合。
We present the study of radiative tau decay ($τ^- \rightarrow π^- ν_τγ$), computing the structure dependent contribution using Light Cone Sum Rules. This decay includes the same form factors as the radiative pion decay with the crucial difference that the momentum transfer squared, $t$, between the pion-photon system is positive, which makes these form factors timelike and also as $t$ can now take values upto $m_τ^2$ , it can produce real hadronic resonances. The analytical form for these form factors has been calculated using light cone sum rules method and the invariant mass-spectrum in the $π-γ$ system and the decay width are presented. The structure dependent parameter, $γ$, the ratio of the axial to vector form factor is found to be in good agreement with the experimental determination.
