# Interplay of Reggeon and photon in pA collisions

## TL;DR

This paper investigates how electromagnetic interactions influence Reggeon exchange in high-energy proton-nucleus collisions at strong coupling, using holographic duality to model the effects.

## Contribution

It introduces a holographic model showing that electromagnetic interactions significantly modify Reggeon exchange in proton-nucleus collisions at strong coupling.

## Key findings

- Electromagnetic interactions alter the Reggeon exchange surface.
- Holographic duality provides a new perspective on high-energy collisions.
- Reggeon surface is twisted by electromagnetic effects.

## Abstract

We discuss the effects of the electromagnetic interaction in high-energy proton collisions with nuclei of large Z at strong coupling $\lambda=g^2N_c$. Using the holographic dual limit of large $N_c>\lambda\gg 1$, we describe the Reggeon exchange as a twisted surface and show that it gets essentially modified by the electromagnetic interaction.