Exclusive Diffractive Processes within the Dipole Picture

TL;DR

This paper compares two models for impact parameter dependent dipole cross sections, fitting parameters to HERA data, extracting the saturation scale, and making predictions for various exclusive diffractive processes at high-energy colliders.

Contribution

It introduces and compares two impact parameter dependent dipole models, fitting them to experimental data and providing predictions for future collider experiments.

Findings

Both models fit HERA total gamma* p cross section data.

The impact parameter dependent saturation scale is extracted.

Predictions for exclusive vector meson and Z^0 production at Tevatron and LHC are provided.

Abstract

We discuss two different models for the impact parameter dependent dipole cross section: one based on DGLAP evolution and the other inspired by the Balitsky-Kovchegov equation. The parameters are determined from fits to data on the total gamma* p cross section measured at HERA. The impact parameter dependent saturation scale is extracted. Predictions are then confronted with HERA data on exclusive diffractive vector meson production and deeply virtual Compton scattering. Finally, predictions are given for the cross sections of exclusive photoproduced J/psi and Upsilon mesons, and Z^0 bosons, expected at the Tevatron and LHC.