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

Exclusive heavy vector meson electroproduction to NLO in collinear factorisation