Electroproduction of heavy vector mesons using holographic QCD: from near threshold to high energy regimes

TL;DR

This paper presents a non-perturbative holographic QCD analysis of heavy vector meson electroproduction across energy regimes, matching experimental data and providing new near-threshold predictions.

Contribution

It introduces a holographic model with soft wall confinement to analyze heavy meson electroproduction from threshold to high energies, including polarization effects.

Findings

Good agreement with HERA data for J/Ψ electroproduction at low and intermediate Q².

Predictions for near-threshold J/Ψ electro-production.

Comprehensive polarization dependence analysis.

Abstract

We develop a non-perturbative analysis of the electro-production of heavy vector mesons ($\phi$, $J/\Psi$) from threshold to high energy. We use the holographic construction with bulk confinement enforced through a soft wall. Using Witten diagrams, we evaluate the pertinent cross sections for heavy vector mesons ($\phi$, $J/\Psi$) production and study their dependence on both the incoming virtual photon polarization as well as the outgoing polarization of the heavy meson. Our results for $J/\Psi$ electro-production compares well with the available HERA data at low and intermediate $Q^2$, and for a wide range of momentum transfer. We also predict the quasi-real electro-production of $J/\Psi$ near threshold.