$\pi\eta$ pair hard electroproduction and exotic hybrid mesons
  We show that hard electroproduction is a promising way to study exotic hybrid mesons, in particular through the hybrid decay channel $H \to \pi\eta $. We discuss the $\pi\eta$ generalized distribution amplitude, calculate the production amplitude and propose a forward-backward asymmetry as a signal for the hybrid meson production. 
I.V. Anikin, B. Pire, L. Szymanowski, O.V. Teryaev, S. Wallon