A new determination of the $\gamma \pi \to \pi \pi$ anomalous amplitude via ${\pi }^{-}{e}^{-}\to {\pi }^{-}{e}^{-}{\pi }^0$ data

I. Giller, A. Ocherashvili, T. Ebertshauser +2

We discuss the reaction ${\pi }^{-}{e}^{-}\to {\pi }^{-}{e}^{-}{\pi }^0$ with the purpose of obtaining information on the $\gamma \pi \to \pi \pi$ anomalous amplitude ${\mathcal{F}}_{3\pi }$. We compare a full calculation a…