Measurement of the E(T,jet)2/Q2 dependence of forward-jet production at HERA
Abstract
The forward-jet cross section in deep inelastic ep scattering has been measured using the ZEUS detector at HERA with an integrated luminosity of 6.36 pb-1. The jet cross section is presented as a function of jet transverse energy squared, E(T,jet)2, and Q2 in the kinematic ranges 10-2<E(T,jet)2/Q2<102 and 2.5 10-4<x<8.0 10-2. Since the perturbative QCD predictions for this cross section are sensitive to the treatment of the log(ET/Q)2 terms, this measurement provides an important test. The measured cross section is compared to the predictions of a next-to-leading order pQCD calculation as well as to various leading-order Monte Carlo models. Whereas the predictions of all models agree with the measured cross section in the region of small E(T,Jet)2/Q2, only one model, which includes a resolved photon component, describes the data over the whole kinematic range.
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