Large t diffractive rho-meson photoproduction with target dissociation in ultraperipheral pA and AA collisions at LHC

TL;DR

This paper proposes studying large t vector meson photoproduction with rapidity gaps in ultraperipheral collisions at LHC to explore dipole-parton interactions across a wide energy range, surpassing HERA's reach.

Contribution

It introduces a novel approach to investigate small dipole interactions and absorption effects in nuclear media using ultraperipheral collisions at LHC, extending the energy range significantly.

Findings

Energy dependence of dipole-parton cross section can be studied over a wide range.

Accessible energy range exceeds HERA by a factor of 10.

Potential to probe the onset of the black disk regime.

Abstract

We demonstrate that study of large t vector meson photoproduction with rapidity gaps in ultraperipheral proton-ion and ion-ion collisions at LHC would allow to investigate the energy dependence of cross section of elastic scattering of a small dipole off the parton over a wide range of energies $10^3 < s_{dipole - parton} < 10^6 GeV^2$ where this cross section is expected to change by a factor $\ge 20$. The accessible energy range exceeds the one reached at HERA by a factor of 10 both in $\gamma p$ and in $\gamma A$ scattering. In addition, study of A-dependence of this process will allow to determine the t range where interaction of small dipoles gives the dominant contribution and to investigate effects of absorption for the propagation of ultrarelativistic small $q\bar q$ dipoles through the nuclear media and probe in a novel way onset of the black disk regime.