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Non-Forward OPE Kernel versus Scalar Form Factor in Near-Threshold $J/ψ$ Photoproduction
Near-threshold $J/ψ$ photoproduction has been used to infer scalar gluonic structure from integrated cross-section data. We test whether such an inference is stable against the assumed non-forward continuation of the OPE kernel. With an exponential diffractive slope fixed, the threshold fit favors a
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