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)

Cao, Ze-Hua ( State Key Laboratory of Particle Detection and Electronics, University of Science and Technology of China, Hefei 230026, China) ( Department of Modern Physics, University of Science and Technology of China, Hefei 230026, China) ; Ruan, Li-Juan ( Brookhaven National Laboratory, New York, USA) ; Tang, Ze-Bo ( State Key Laboratory of Particle Detection and Electronics, University of Science and Technology of China, Hefei 230026, China) ( Department of Modern Physics, University of Science and Technology of China, Hefei 230026, China) ; Xu, Zhang-Bu ( Brookhaven National Laboratory, New York, USA) ( Shandong University, Jinan 250100, China) ; Yang, Chi ( Shandong University, Jinan 250100, China) ; Yang, Shuai ( Brookhaven National Laboratory, New York, USA) ; Zha, Wang-Mei ( State Key Laboratory of Particle Detection and Electronics, University of Science and Technology of China, Hefei 230026, China) ( Department of Modern Physics, University of Science and Technology of China, Hefei 230026, China)

20 May 2019

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.


Published in: Chinese Phys. C 43 (2019) 064103
Published by: Institute of Physics Publishing/Chinese Academy of Sciences
DOI: 10.1088/1674-1137/43/6/064103
License: CC-BY-3.0



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