Physics – High Energy Physics – High Energy Physics - Experiment
Scientific paper
1998-06-25
Eur.Phys.J.C13:415-426,2000
Physics
High Energy Physics
High Energy Physics - Experiment
22 pages, 5 figures, 1 table, submitted to Eur. Phys. J., corrected author list
Scientific paper
10.1007/s100520050705
Di-jet event rates have been measured for deep-inelastic scattering in the kinematic domain ~5 < Q^2 < ~100 GeV^2 and ~10^(-4) < x_Bj < ~10^(-2), and for jet transverse momenta squared p_t^2 > ~Q^2. 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 Q^2 and x_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.
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