Exclusive heavy vector meson electroproduction to NLO in collinear factorisation

We compute the exclusive electroproduction, $\gamma^* p \rightarrow V p$, of heavy quarkonia $V$ to NLO in collinear factorisation scheme, which has been formally proven for this process. The inclusion an off-shell virtuality $Q^2$ carried by photon extends photoproduction phase space observable electroproduction kinematics. This process is relevant diffractive scattering at HERA and upcoming EIC, as well proposed LHeC FCC.