English

Photoproduction of J/$\psi$ in non-single-diffractive p+p collisions

High Energy Physics - Phenomenology 2019-09-04 v1 Nuclear Theory

Abstract

Recently, significant enhancements of J/ψ\psi production at very low transverse momenta were observed by the ALICE and STAR collaboration in peripheral hadronic A+A collisions. The anomaly excesses point to evidence of 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 which is 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 J/ψ\psi photoproduction in non-single-diffractive p+p collisions at RHIC and LHC energies base on the pQCD motivated parametrization from world-wide experimental data, which could be further employed to improve the precision of phenomenal calculations for photoproduction in A+A collisions. The differential rapidity and transverse momentum distributions of J/ψ\psi from photoproduction are presented. In comparison with the J/ψ\psi production from hadronic interactions, we find that the contribution of photoproduction is negligible.

Keywords

Cite

@article{arxiv.1810.10685,
  title  = {Photoproduction of J/$\psi$ in non-single-diffractive p+p collisions},
  author = {Zehua Cao and Lijuan Ruan and Zebo Tang and Zhangbu Xu and Chi Yang and Shuai Yang and Wangmei Zha},
  journal= {arXiv preprint arXiv:1810.10685},
  year   = {2019}
}