$η$ and $η'$ transition form factors from Padé approximants

We employ a systematic and model-independent method to extract, from space- and time-like data, the $η$ and $η'$ transition form factors (TFFs) obtaining the most precise determination for their low-energy parameters and discuss the $Γ_{η\rightarrowγγ}$ impact on them. Using TFF data alone, we also extract the $η-η'$ mixing parameters, which are compatible to those obtained from more sophisticated and input-demanding procedures.

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