Phenomenological model for the $γ^*γ\to ηπ^+ π^-$ reaction in the $f_1(1285)$ energy region

Xiu-Lei Ren, Igor Danilkin, Marc Vanderhaeghen

Motivated by the ongoing analysis by the BESIII Collaboration on the single-tagged $e^{+}{e}^{-}\to e^{+}{e}^{-}\hat{I}\cdot \ddot{I}{€}^{+}\ddot{I}{€}^{-}$ reaction, we present a phenomenological study of the diphoton fusio…