Abstract
AbstractCharmonium production associated with a photon in coherent hadron–hadron interactions at high‐energy colliders is a suitable observable to test the partonic density function in the proton and in nuclei. We employ nonrelativistic quantum chromodynamics to investigate the transverse momentum distribution and total cross sections of J/ψ + γ production at the Large Hadron Collider (LHC) and the electron‐ion collider (EIC). Our results show that discrimination can be made to test the parameters for the matrix elements operators, which varies by a factor of 3. A higher transverse momentum region is more sensitive for pPb collisions at the LHC, although the EIC kinematic region is also favorable at low transverse momentum.
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