Probing Saturation Physics in the Real Compton Scattering at Ultraperipheral $pPb$ Collisions

TL;DR

This paper investigates real Compton scattering in ultraperipheral pPb collisions at RHIC and LHC energies, highlighting the impact of saturation effects in QCD dynamics on observable distributions, and suggests experimental probing of high-energy QCD.

Contribution

It introduces a model combining Reggeon and Pomeron contributions with saturation effects in the Pomeron, providing predictions for scattering distributions at high energies.

Findings

Cross sections at large t and Y are dominated by Pomeron contributions.

Non-linear saturation effects significantly influence the scattering behavior.

Future experiments can use these results to probe high-energy QCD dynamics.

Abstract

The Real Compton Scattering in ultraperipheral $pPb$ collisions at RHIC and LHC energies is investigated and predictions for the squared transverse momentum ($t$) and rapidity ($Y$) distributions are presented. The scattering amplitude is assumed to be given by the sum of the Reggeon and Pomeron contributions and the Pomeron one is described by the Color Dipole formalism taking into account the non - linear (saturation) effects in the QCD dynamics. We demonstrate that the behaviour of the cross sections at large -- $t$ and/or $Y$ is dominated by the Pomeron contribution and is strongly affected by the non -- linear effects present in the QCD dynamics. These results indicate that a future experimental analysis of this process can be useful to probe the QCD dynamics at high energies.