Measurement of inclusive jet cross sections in photoproduction at HERA

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 Q2≤1GeV2 and photon-proton centre-of-mass energies 95≤Wγp≤285GeV represents an integrated luminosity of 24.1pb−1. Jets are defined using the inclusive k⊥ algorithm. Single- and multi-differential cross sections are measured as functions of jet transverse energy E T jet and pseudorapidity ηjet in the domain 5≤EjetT≤75GeV and −1≤ηjet≤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 pp¯¯¯ colliders at equal and higher energies.