Photoproduction of Upsilon in Ultraperipheral Collisions at LHC Run2 energies

TL;DR

This paper investigates the photoproduction of Upsilon particles in ultraperipheral collisions at LHC energies using pQCD, aiming to constrain gluon distributions in protons and nuclei at low x, with predictions for upcoming measurements.

Contribution

It provides theoretical predictions for Upsilon photoproduction cross-sections and rapidity distributions in ultraperipheral collisions at LHC Run 2 energies, incorporating various gluon distribution models.

Findings

Predicted rapidity distributions vary with gluon shadowing models.

Cross-section predictions for pPb and PbPb collisions at specific energies.

Insights into gluon distribution constraints at low x.

Abstract

The exclusive $\Upsilon$ photoproduction in ultraperipheral proton-nucleus and nucleus-nucleus collisions at LHC energies is being investigated using pQCD framework which constrain the gluon distribution in the proton and nuclei at low $x$. Rapidity distributions of $\Upsilon$ photoproduction with different gluon distribution parameterization and gluon shadowing for nuclear PDFs including photon flux suppression for strong interaction, are being presented at LHC energies. Predictions done for ultraperipheral collisions at $\sqrt s$=$8.16$ TeV in pPb, and at $\sqrt s$=$5.02$ TeV in PbPb collisions which are LHC Run 2 Heavy Ion collision scenario and measurements of cross-section will be available soon.