Momentum transfer dependence of heavy quarkonium electroproduction

TL;DR

This paper studies how the differential cross sections in heavy quarkonium electroproduction depend on momentum transfer, emphasizing the importance of impact parameter and dipole orientation correlations within a light-front QCD dipole model.

Contribution

It introduces a realistic impact parameter and dipole orientation correlation model and compares it with standard approximations in heavy quarkonium electroproduction.

Findings

Correlation between impact parameter and dipole orientation significantly affects predictions.

Model demonstrates differences from simplified assumptions commonly used.

Highlights importance of detailed impact parameter modeling in QCD dipole formalism.

Abstract

We investigate the momentum transfer dependence of differential cross sections $d\sigma/dt$ in diffractive electroproduction of heavy quarkonia on proton targets. Model predictions for $d\sigma/dt$ within the light-front QCD dipole formalism are based on a realistic model for a proper correlation between the impact parameter $\vec b$ of a collision and color dipole orientation $\vec r$. We demonstrate a significance of $\vec b-\vec r$ correlation by comparing with a standard simplification $\vec{b}\parallel\vec{r}$, frequently used in the literature.