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Near-Threshold OPE Constraints and High-Energy Diffractive Dynamics in J/psi Photoproduction
We study the forward $J/ψN$ amplitude $M_{ψN}(λ)$ using a leading-twist Coulombic operator-product expansion, exact physical-domain target-mass resummation, and modern gluon PDFs. Forward-intercept extrapolations reported by GlueX and CLAS12 constrain the amplitude modulus within a vector-meson-domi
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