Charmonium 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.

中文翻译：

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大型强子对撞机和电子-离子对撞机的联合生产J /ψ+γ

在高能对撞机上，光子在相干强子-强子相互作用中与光子有关，可以很方便地观察到质子和原子核中的粒子密度函数。我们采用非相对论量子色动力学研究大型强子对撞机（LHC）和电子离子对撞机（EIC）的横向动量分布和J / ψ  +  γ产生的总横截面。我们的结果表明，可以进行区分来测试矩阵元素算子的参数，该参数变化3倍。尽管EIC运动学区域也很有利，但较高的横向动量区域对LHC处的p Pb碰撞更敏感。在较低的横向动量。