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

TL;DR

This paper calculates the contribution of coherent photoproduction of J/ψ in non-single-diffractive p+p collisions at RHIC and LHC, finding it negligible compared to hadronic production, and provides distributions to improve understanding of photoproduction mechanisms.

Contribution

It introduces a pQCD-based calculation of J/ψ photoproduction in non-single-diffractive p+p collisions, extending the understanding of photon-induced processes in hadronic interactions.

Findings

Photoproduction contribution is negligible compared to hadronic production.

Provides rapidity and transverse momentum distributions for photoproduced J/ψ.

Method can improve precision of photoproduction modeling in A+A collisions.

Abstract

Recently, significant enhancements of J/$\psi$ 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/$\psi$ 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/$\psi$ from photoproduction are presented. In comparison with the J/$\psi$ production from hadronic interactions, we find that the contribution of photoproduction is negligible.