EPJ

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EPJ C - Particles and Fields
Particles and Fields
Eur. Phys. J. C 13, 415-426
DOI 10.1007/s100520000165

Di-jet event rates in deep-inelastic scattering at HERA

The H1 Collaboration

C. Adloff35 - et al.

35 DESY, Institut für Hochenergiephysik, Zeuthen, Germany

Received: 2 March 1999 / Revised version: 24 July 1999 /
Published online: 28 September 1999 - © Springer-Verlag 2000

Abstract
Di-jet event rates have been measured for deep-inelastic scattering in the kinematic domain
5  $\stackrel{\textstyle<}{\sim}$ Q2 $\stackrel{\textstyle<}{\sim}$ $100 \mbox{ GeV}^2 $ and 10-4 $\stackrel{\textstyle<}{\sim}$ \ensuremath{x_{\mathit{Bj}}} $\stackrel{\textstyle<}{\sim}$ 10-2, and for jet transverse momenta squared pt*2 $\stackrel{\textstyle>}{\sim}$ Q2. The analysis is based on data collected with the H1 detector at HERA in 1994 corresponding to an integrated luminosity of about 2 pb-1. Jets are defined using a cone algorithm in the photon-proton centre of mass system requiring jet transverse momenta of at least 5 GeV. The di-jet event rates are shown as a function of Q2 and \ensuremath{x_{\mathit{Bj}}}. Leading order models of point-like interacting photons fail to describe the data. Models which add resolved interacting photons or which implement the colour dipole model give a good description of the di-jet event rate. This is also the case for next-to-leading order calculations including contributions from direct and resolved photons.

Copyright Società Italiana di Fisica, Springer-Verlag 2000

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