Measurement of Dijet Photoproduction at High Transverse Energies at HERA

TL;DR

This paper reports measurements of dijet photoproduction cross sections at high transverse energies at HERA, comparing experimental data with QCD predictions and finding higher observed cross sections than theoretical calculations in certain regimes.

Contribution

First measurement of high transverse energy dijet photoproduction cross sections at HERA with detailed comparison to NLO QCD calculations.

Findings

Measured cross sections are higher than NLO QCD predictions in specific kinematic regions.

Data collected with ZEUS detector at 6.3 pb^(-1) luminosity.

Results suggest possible need for refined theoretical models or higher-order corrections.

Abstract

The cross section for dijet photoproduction at high transverse energies is presented as a function of the transverse energies and the pseudorapidities of the jets. The measurement is performed using a sample of ep-interactions corresponding to an integrated luminosity of 6.3 pb^(-1), recorded by the ZEUS detector.Jets are defined by applying a k_T-clustering algorithm to the hadrons observed in the final state. The measured cross sections are compared to next-to-leading order QCD calculations. In a kinematic regime where theoretical uncertainties are expected to be small, the measured cross sections are higher than these calculations.