Cross-section measurement of two-photon annihilation in-flight of positrons at $\sqrt{s}=20$ MeV with the PADME detector

F. Bossi, P. Branchini, B. Buonomo +35

The inclusive cross-section of annihilation in flight $e^{+}{e}^{-}\to \gamma \gamma$ of 430 MeV positrons with atomic electrons of a thin diamond target has been measured with the PADME det…