Photon Structure and the Hadronic Final State in Photoproduction Processes at ZEUS

TL;DR

This paper reports on ZEUS experiments at HERA that investigate photon structure and test perturbative QCD through dijet and multijet production measurements involving quasi-real and virtual photons.

Contribution

It provides new measurements of dijet and multijet production, including those with $D^{*\pm}$ mesons, and compares them to NLO calculations, enhancing understanding of photon structure.

Findings

Measurements agree with NLO calculations

Photon structure insights improved

Dijet production with $D^{*\pm}$ mesons characterized

Abstract

Advances in knowledge of the structure of the photon and tests of perturbative QCD have been made using the increased luminosity with the ZEUS detector at HERA. Events with a low photon virtuality and two high transverse energy jets have been studied. Measurements of inclusive dijet and multijet production are herein compared to Next-to-Leading-Order calculations. In order to analyse the structure of the photon, dijet production of quasi-real and virtual photons and dijet production containing $D^{*\pm}$ mesons were measured.