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Elsevier, Physics Letters B, 1-2(474), p. 223-233, 2000

DOI: 10.1016/s0370-2693(99)01478-1

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Measurement of the E(T,jet)**2/Q**2 dependence of forward- jet production at HERA

Journal article published in 2000 by J. Breitweg, S. Chekanov, M. Derrick, D. Krakauer, S. Magill, B. Musgrave, A. Pellegrino, J. Repond, R. Stanek, R. Yoshida, M. C. K. Mattingly, G. Abbiendi, F. Anselmo, P. Antonioli, G. Bari and other authors.
This paper is made freely available by the publisher.
This paper is made freely available by the publisher.

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Data provided by SHERPA/RoMEO

Abstract

The forward-jet cross section in deep inelastic e+p 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, E2T,jet, and Q2 in the kinematic ranges 10−2<E2T,jet/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(E2T,jet/Q2) 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 E2T,jet/Q2, only one model, which includes a resolved photon component, describes the data over the whole kinematic range.