DOI 10.1007/s100529800962
Low Q2 jet production at HERA in next-to-leading order QCD
G. Kramer - B. Pötter
II. Institut für Theoretische
Physik,
Universität Hamburg, Luruper Chaussee 149, D-22761 Hamburg, Germany
(e-mail: kramer@mail.desy.de, poetter@mail.desy.de)
Received: 23 April 1998 / Published online: 26 August 1998
Abstract
We present next-to-leading order calculations of one-
and two-jet production in eP collisions at HERA for photon
virtualities in the range 1<Q2<100 GeV2. Soft and collinear
singularities are extracted using the phase space slicing
method. Numerical results are presented for HERA conditions with the
Snowmass jet definition. The transition between photoproduction and
deep-inelastic scattering is investigated in detail. We compare two
approaches, the usual deep-inelastic theory, where the virtual photon
couples only directly to quarks and antiquarks, and the
photoproduction approach, where the photon couples either in the
direct way or in the resolved way via the parton constituents of the
virtual photon with the proton constituents. Finally we compare with
recent H1 data of the dijet rate obtained for various photon
virtualities Q2 with special attention to the region, in which two
jets have equal transverse momenta.
Copyright Springer-Verlag
