\documentstyle[12pt,ichep98]{article}
\begin{document}

\begin{flushright}

{\bf Abstract Registration Number 523} \\
{\bf Parallel sessions: 3,5} \\
{\bf Plenary sessions: 5,7}
\end{flushright}
\abstractheader{\bf Di-jet Rates in Deep Inelastic Scattering at HERA\\
H1 Collaboration, DESY}

\abstractbody{
Di-jet event rates have been measured for deep-inelastic scattering in
the kinematic domain 5~\raisebox{-.8ex}
{$\stackrel{\textstyle<}{\sim}$} $Q^2$ \raisebox{-.8ex}
{$\stackrel{\textstyle<}{\sim}$} $100 \mbox{ GeV}^2 $ and $ 10^{-4}$
\raisebox{-.8ex} {$\stackrel{\textstyle<}{\sim}$} $x_{bj}$\
\raisebox{-.8ex} {$\stackrel{\textstyle<}{\sim}$} $10^{-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}$.
The results have been corrected for detector effects. Jets are defined
using a cone algorithm in the photon-proton centre of mass system
requiring jet transverse momenta of at least 5 GeV. Di-jet event rates are
shown as a function of $Q^2$ and $x_{bj}$, and are compared to models
and next to leading order calculations based on perturbative QCD.
Models of point-like interactions with the photon implementing leading
order matrix elements in combination with parton showers fail to descibe
the data. NLO calculations, including contributions from direct and
resolved virtual photons, provide a good description of the data. The
di-jet event rate can also be desribed by a model in leading order by
adding a contribution from the resolved photon or by the colour dipole
model. 
}

\end{document}