Measurement of inclusive jet cross sections in photoproduction at HERA

TL;DR

This paper reports measurements of inclusive jet cross sections in photoproduction at HERA, comparing experimental data with next-to-leading order QCD calculations, and analyzing the energy dependence of jet production.

Contribution

First measurement of inclusive jet cross sections in photoproduction at HERA with detailed comparison to NLO QCD predictions.

Findings

Good agreement between measured cross sections and NLO QCD calculations.

Jet cross sections span six orders of magnitude in E_T^jet.

Comparison of energy dependence with p pbar collider data.

Abstract

Inclusive jet cross sections are measured in photoproduction at HERA using the H1 detector. The data sample of e+ p -> e+ + jet + X events in the kinematic range of photon virtualities Q^2 < 1 GeV^2 and photon-proton centre-of-mass energies 95 < W_gammap < 285 GeV represents an integrated luminosity of 24.1 pb^-1. Jets are defined using the inclusive k_T algorithm. Single- and multi-differential cross sections are measured as functions of jet transverse energy E_T^jet and pseudorapidity \eta^jet in the domain 5 < E_T^jet < 75 GeV and -1 < \eta^jet < 2.5. The cross sections are found to be in good agreement with next-to-leading order perturbative QCD calculations corrected for fragmentation and underlying event effects. The cross section differential in E_T^jet, which varies by six orders of magnitude over the measured range, is compared with similar distributions from p pbar colliders at equal and higher energies.