Vector Mesons and pQCD at HERA

TL;DR

This paper reviews recent experimental results on vector meson production at HERA, comparing data with pQCD predictions and exploring dependencies on energy and various scales in electron-proton collisions.

Contribution

It provides new measurements of inelastic J/Psi electroproduction and compares these with different theoretical models, enhancing understanding of QCD processes at HERA.

Findings

Energy dependence of diffractive vector meson production analyzed

Differential cross sections for J/Psi production compared to theoretical models

Data show consistency with color singlet and octet contributions in pQCD

Abstract

An overview of recent results from the H1 and ZEUS collaborations on vector meson production in electron-proton collisions at HERA is given. For diffractive vector meson production the energy dependence is discussed. The dependences on different scales, M_VM, Q^2 and |t|, are investigated. The data are compared to pQCD theoretical calculations. In addition new results on inelastic J/Psi electroproduction in a kinematical range 2<Q^2<100 GeV^2 and 50<W<225 GeV are shown. Differential cross sections are compared to theoretical predictions for color singlet and color octet contributions as well as to calculations for color singlet contributions alone.