Inclusive-jet and dijet cross sections in deep inelastic scattering at HERA

TL;DR

This paper reports measurements of inclusive-jet and dijet cross sections in high-Q2 deep inelastic scattering at HERA, comparing results with QCD predictions to improve understanding of proton structure.

Contribution

First detailed measurements of jet cross sections at high Q2 in DIS at HERA, aiding constraints on the gluon density in the proton.

Findings

QCD calculations describe the measurements well

Identified phase space regions with small theoretical uncertainties

Potential to constrain proton gluon density

Abstract

Inclusive-jet and dijet differential cross sections have been measured in neutral current deep inelastic ep scattering for exchanged boson virtualities Q2 > 125 GeV2 with the ZEUS detector at HERA using an integrated luminosity of 82 pb-1. Jets were identified in the Breit frame using the kt cluster algorithm. Jet cross sections are presented as functions of several kinematic and jet variables. The results are also presented in different regions of Q2. Next-to-leading-order QCD calculations describe the measurements well. Regions of phase space where the theoretical uncertainties are small have been identified. Measurements in these regions have the potential to constrain the gluon density in the proton when used as inputs to global fits of the proton parton distribution functions.