QCD rescattering mechanism for diffractive deep inelastic scattering

TL;DR

This paper introduces a QCD-based rescattering model for diffractive deep inelastic scattering, explaining large rapidity gaps and leading protons, and successfully describing HERA data across all kinematic ranges.

Contribution

The paper develops a novel QCD rescattering model with all-order gluon exchange calculations, providing new insights into gluon density at small momentum fractions.

Findings

Model accurately fits HERA diffractive cross section data

Provides a unified description across all kinematic ranges

Offers new understanding of gluon density at small x

Abstract

We present a QCD-based model where rescattering between final state partons in deep inelastic scattering leads to events with large rapidity gaps and a leading proton. In the framework of this model the amplitude for multiple gluon exchanges is calculated in the eikonal approximation to all orders in perturbation theory. Both large and small invariant mass M_X limits are considered. The model successfully describes the precise HERA data on the diffractive deep inelastic cross section in the whole available kinematical range and gives new insight into the density of gluons at very small momentum fractions in the proton.