Elastic and quasi-elastic $pp$ and $\gamma^\star p$ scattering in the Dipole Model

TL;DR

This paper extends a dipole cascade model to describe quasi-elastic processes like vector meson production and DVCS in $oldsymbol{ ext{ep}}$ scattering, achieving good agreement with experimental data and providing insights into elastic and quasi-elastic scattering mechanisms.

Contribution

The paper introduces an extension of the dipole model to accurately describe quasi-elastic $oldsymbol{ ext{ep}}$ scattering processes, including vector meson production and DVCS, with improved agreement to data.

Findings

Good agreement with measured cross sections for vector meson production and DVCS.

Reasonable description of the $t$-dependence of elastic and quasi-elastic cross sections.

Extended model successfully describes quasi-elastic scattering in $oldsymbol{ ext{ep}}$ collisions.

Abstract

We have in earlier papers presented an extension of Mueller's dipole cascade model, which includes sub-leading effects from energy conservation and running coupling as well as colour suppressed saturation effects from pomeron loops via a ``dipole swing''. The model was applied to describe the total and diffractive cross sections in $pp$ and $\gamma^*p$ collisions, and also the elastic cross section in $pp$ scattering. In this paper we extend the model to describe the corresponding quasi-elastic cross sections in $\gamma^*p$, namely the exclusive production of vector mesons and deeply virtual compton scattering. Also for these reactions we find a good agrement with measured cross sections. In addition we obtain a reasonable description of the $t$-dependence of the elastic $pp$ and quasi-elastic $\gamma^\star p$ cross sections.