论文标题
Lepton-Pair Production in Di-Pion $τ$ Lepton腐烂
Lepton-pair production in di-pion $τ$ lepton decays
论文作者
论文摘要
我们研究$τ^ - \至ν_τπ^{ - }π^{0} \ ell^{+} \ ell^{ - } $（$ \ ell = e，\，μ$）的衰减，$ O（α^2）$ - 抑制了对主导di-pion tau-pion tau deay deay deay deay tau deay deay。都考虑了内部布雷姆斯斯特朗和结构 - （和模型）依赖的贡献。在$ \ ell = e $案例中，衰减率的结构依赖性效果为$ \ MATHCAL {O}（1 \％）$，得出其分支比的干净预测，$ 2.3 \ times10^{ - 5} $，可用于Babar或Belle（-ii）（-ii）数据。对于$ \ ell =μ$，这两个贡献都具有相似的幅度，并且我们的分支分数为$（1.6 \ pm0.3）\ times10^{ - 7} $，在Belle-II操作结束时到达。这些衰减可以研究与同时弱和电磁探针强烈相互作用的动力学。他们的知识将有助于减少Lepton风味/违反数量搜索的背景。
We study the $τ^- \to ν_τ π^{-}π^{0}\ell^{+}\ell^{-}$ ($\ell=e,\,μ$) decays, which are $O(α^2)$-suppressed with respect to the dominant di-pion tau decay channel. Both the inner-bremsstrahlung and the structure- (and model-)dependent contributions are considered. In the $\ell=e$ case, structure-dependent effects are $\mathcal{O}(1\%)$ in the decay rate, yielding a clean prediction of its branching ratio, $2.3\times10^{-5}$, measurable with BaBar or Belle(-II) data. For $\ell=μ$, both contributions have similar magnitude and we get a branching fraction of $(1.6\pm0.3)\times10^{-7}$, reachable by the end of Belle-II operation. These decays allow to study the dynamics of strong interactions with simultaneous weak and electromagnetic probes; their knowledge will contribute to reducing backgrounds in lepton flavor/number violating searches.
