The $\pi^0$, $\eta$, and $\eta^\prime$ transition form factors in thespace-like region are analyzed at low and intermediate energies in amodel-independent way through the use of rational approximants. Slope andcurvature parameters as well as their values at infinity are extracted fromexperimental data. These results are suited for constraining hadronic modelssuch as the ones used for the hadronic light-by-light scattering piece of theanomalous magnetic moment of the muon, and for the mixing parameters of the$\eta - \eta^\prime$ system.
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机译：通过使用有理近似值，以模型无关的方式在低能和中能下分析类空间区域中的$ \ pi ^ 0 $，$ \ eta $和$ \ eta ^ \ prime $过渡形状因子。从实验数据中提取坡度和曲率参数以及它们在无限远处的值。这些结果适用于约束强子模型，例如用于μ子磁矩磁矩的强子逐光散射模型，以及η-eta-\ prime系统的混合参数。
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