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

Understand

We propose a novel approach to compute the cross section of near-threshold $J/\psi$ and $\Upsilon$ production in electron-proton scattering at large photon virtualities $Q^2$ based on an operator product expansion.

• We show that the process can be used to extract the gluon part of the D-term gravitational form factor of the proton.
• At the subleading level, it is also sensitive to the trace anomaly effect of QCD.