论文标题
$ b \ to d^{（*）}τν$衰减的tau polarimetry的完整框架
A Complete Framework for Tau Polarimetry in $B\to D^{(*)}τν$ Decays
论文作者
论文摘要
梅森腐烂$ b \ todτν$和$ b \ to d^*τν$是$ b \ tocτν$ transition的敏感探针。在这项工作中，我们提出了一个完整的框架，以获取有关$ b \ to d^{（*）}τν$的最大信息，并带有偏光$τ$ leptons和uncolarized $ d^{（*）} $ mesons。专注于hadronic衰变$τ\ toπν$和$τ\toρν$，我们展示了如何从对最终国家运动学的完全差分分析中提取七个$τ$ yymmetries。在$ 50〜 \ text {ab}^{ - 1} $的$ 50〜 \ text { - 1} $的Belle II上，这些不对称的可能以级别级别的统计不确定性来衡量。这将为$ b \ tocτν$中可能的新物理贡献打开一个新窗口，并使我们能够破译其Lorentz和仪表结构。
The meson decays $B\to Dτν$ and $B\to D^* τν$ are sensitive probes of the $b\to cτν$ transition. In this work we present a complete framework to obtain the maximum information on the physics of $B\to D^{(*)}τν$ with polarized $τ$ leptons and unpolarized $D^{(*)}$ mesons. Focusing on the hadronic decays $τ\to πν$ and $τ\toρν$, we show how to extract seven $τ$ asymmetries from a fully differential analysis of the final-state kinematics. At Belle II with $50~\text{ab}^{-1}$ of data, these asymmetries could potentially be measured with percent level statistical uncertainty. This would open a new window into possible new physics contributions in $b\to cτν$ and would allow us to decipher its Lorentz and gauge structure.
