坚持实验数据的作用：从$B \to π\ell ν_{\ell}$微分分支比到$(g_μ-2)$和$|V_{ub}|$的伪标量极片
Insisting on the role of experimental data: the pseudoscalar-pole piece to the $(g_μ-2)$ and the $|V_{ub}|$ from $B \to π\ell ν_{\ell}$ differential branching ratio
摘要：
为了计算介子形状因子，我们采用了一个基于有理近似的数学框架。该方法得益于单一的，是系统的和基于数据的，并且能够归因于系统的不确定性，这提供了所需的模型独立性。讨论了两个例子：进入强子的赝标极片的跃迁形状因子对μ子的异常磁矩的光-光贡献，以及参与$B\toπ\ellν_{\ell}$微分分支比的$B \to π$形状因子，其允许确定$|V_{ub}|$ CKM参数。
英文摘要：
We employ a mathematical framework based on rational approximants in order to calculate meson form factors. The method profits from unitary, is systematic and data based, and is able to ascribe a systematic uncertainty which provides for the desired model independence. Two examples are discussed: the transition form factor entering the pseudoscalar-pole piece of the hadronic light-by-light contribution to the anomalous magnetic moment of the muon, and the $B \to π$ form factor participating the $B\toπ\ellν_{\ell}$ differential branching ratios which allows to determine the $|V_{ub}|$ CKM parameter.
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