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We propose a novel approach to compute the cross section of near-threshold$J/\psi$ and $\Upsilon$ production in electron-proton scattering at largephoton virtualities $Q^2$ based on an operator product expansion. We show thatthe process can be used to extract the gluon part of the D-term gravitationalform factor of the proton. At the subleading level, it is also sensitive to thetrace anomaly effect of QCD.

A QCD analysis of near-threshold quarkonium leptoproduction at large photon virtualities