Contribution Oral presentation
Pseudoscalar-exchange contribution to g-2 from rational approximants
Padé Approximants have been used to describe the light pseudoscalars transition form factors (TFFs) in the space-like region. Once the low energy parameters are determined from a fit to data, they provide a systematic and model-independent tool for describing the TFFs.
We discuss their generalization to the bivariate case, which allows a systematic description for the double-virtual TFF. This is of utmost relevance for the Light-by-Light contribution to g-2. Lacking double-virtual data, we discuss expectations and its connection with pseudoscalar decays into lepton-pairs.