Data-based form factor corrections between the two-pion $\tau$ and $e^{+}{e}^{-}$ spectral functions

Michel Davier, Bogdan Malaescu, Zhiqing Zhang

The $\tau$ spectral functions are an alternative to $e^{+}{e}^{-}$ cross-sections, where different measurements are not consistent, for computing the hadronic vacuum contribution to the muo…