Integrated σ(W) data for near-threshold J/ψ photoproduction cannot determine the non-forward OPE kernel or isolate a scalar G_S(t) contribution; differential dσ/dt data are required.
Syamtomov.J/ψphotoproduction from threshold to HERA: leading-twist convolution, small- xpathology, and eikonal unitarization
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Non-Forward OPE Kernel versus Scalar Form Factor in Near-Threshold $J/\psi$ Photoproduction
Integrated σ(W) data for near-threshold J/ψ photoproduction cannot determine the non-forward OPE kernel or isolate a scalar G_S(t) contribution; differential dσ/dt data are required.