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We study sub-threshold heavy quarkonium ($J/\psi$ and $\Upsilon$)photo-productions in $\gamma A$ collisions as an independent test of theuniversality of the nucleon-nucleon short range correlation (SRC) in nuclearscattering processes. Just below the $\gamma p$ threshold, the cross section isdominated by the mean field contribution of nucleons inside the nucleus. TheSRC contributions start to dominate at lower photon energies, depending on thefraction of the SRC pairs in the target nucleus. We give an estimate of thecross sections in the sub-threshold region both for $J/\psi$ and $\Upsilon$.This may be helpful for future measurements at JLab as well as at theElectron-Ion Collider in the U.S., and especially in China.

Sub-threshold $J/\psi$ and $\Upsilon$ Production in $\gamma A$ Collisions