Probing the photon flux in the diffractive quarkonium photoproduction at LHC

TL;DR

This paper investigates diffractive quarkonium photoproduction in proton-proton collisions at LHC to understand the photon flux, especially the inelastic component, through theoretical predictions and potential experimental constraints.

Contribution

It provides estimates of rapidity distributions and cross sections for quarkonium production, highlighting the significance of the inelastic photon component and proposing experimental methods to constrain it.

Findings

Inelastic photon contribution is comparable to elastic in predictions.

Predicted cross sections for J/Ψ, Ψ′, and Υ are significant.

Experimental proton tagging can help determine the inelastic photon flux.

Abstract

In this paper we propose the study of the diffractive quarkonium photoproduction in $pp$ collisions at LHC energies to probe the photon flux associated to a ultrarelativistic proton. The total photon distribution is expected to be given in terms of the elastic and inelastic components. Distinctly from the elastic photon component which can be determined from the elastic form factors, the magnitude of the inelastic component still is an open question. We consider the current parametrizations for the photon distribution of a proton and estimate the rapidity distributions and total cross sections for the production of $J/\Psi$, $\Psi^{\prime}$ and $\Upsilon$ at LHC energies. We demonstrate that the predictions associated to the inelastic contribution are of the same order than those associated to the elastic one. Our results implies that a dedicated experimental analysis of diffractive quarkonium photoproduction with the tagging of the two protons in the final state can be useful to constrain the magnitude of the inelastic component of the photon distribution.