Photoproduction of J/ψ in non-single-diffractive p+p collisions * * Supported by the National Natural Science Foundation of China (11775213, 11505180, 11675168), the U.S. DOE Office of Science (DE-SC0012704) and MOST (2016YFE0104800)

Abstract

Significant enhancements of production at very low transverse momenta were recently observed by the ALICE and STAR collaborations in peripheral hadronic A+A collisions. The anomalous excess points to coherent photon-nucleus interactions in violent hadronic heavy-ion collisions, which were conventionally studied only in ultra-peripheral collisions. Assuming that the coherent photoproduction is the underlying mechanism responsible for the excess observed in peripheral A+A collisions, its contribution in p+p collisions with nuclear overlap, i.e. non-single-diffractive collisions, is of particular interest. In this paper, we perform a calculation of exclusive photoproduction in non-single-diffractive p+p collisions at the RHIC and LHC energies based on the pQCD motivated parametrization using the world-wide experimental data, which could be further employed to improve the precision of the phenomenological calculations for photoproduction in A+A collisions. The differential rapidity and transverse momentum distributions of from photoproduction are presented. In comparison with the production from hadronic interactions, we find that the contribution of photoproduction is negligible.