The European Physical Journal C

ISSN: 1434-6044 (printed version)
ISSN: 1434-6052 (electronic version)

Table of Contents

Abstract Volume 4 Issue 4 (1998) pp 591-606
DOI 10.1007/s100529800916

experimental physics:
High-$E_T$ inclusive jet cross sections in photoproduction at HERA

The ZEUS Collaboration , J. Breitweg et al.

Argonne National Laboratory, Argonne, IL, USA

Received: 11 February 1998 / Published online: 2 July 1998

Abstract. Inclusive jet differential cross sections for the reaction $e^+p\rightarrow e^+ +{\rm jet} + {\rm X}$ with quasi-real photons have been measured with the ZEUS detector at HERA. These cross sections are given for the photon-proton centre-of-mass energy interval 134 $W are presented and compared to next-to-leading order (NLO) QCD calculations. For jets defined with $R=1.0$ differences between data and NLO calculations are seen at high $\eta^{jet}$ and low $E_T^{jet}$. The measured cross sections for jets defined with $R=0.7$ are well described by the calculations in the entire measured range of $\eta^{jet}$ and $E_T^{jet}$. The inclusive jet cross section for $E_T^{jet}>21$ GeV is consistent with an approximately linear variation with the cone radius R in the range between 0.5 and 1.0, and with NLO calculations.

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Online publication: July 20, 1998
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