Kinematical higher-twist corrections in ${\gamma }^{\ast }\to M_1{M}_2\gamma$: Charged meson production

Bernard Pire, Qin-Tao Song

Generalized distribution amplitudes (GDAs) of mesons can be probed by the reactions $e^{-}{e}^{+}\to M_1{M}_2\gamma$, which are accessible at electron-positron colliders such as BESIII and…