\documentstyle[12pt,epsf,epsfig,wrapfig]{article}
\pagestyle{empty}
%
%   LaTeX format for a contributed Abstract to the
%
%                         P H O T O N 9 9
%                          Freiburg
%                       May  23 - 27, 1999
%
%                  Copied with permission from PHOTON 97
%                  Copied without permission from SPIN 96
%
\setlength{\hoffset}          {0mm}
\setlength{\voffset}          {0mm}
\setlength{\oddsidemargin}    {0mm}
\setlength{\evensidemargin}   {0mm}
\setlength{\topmargin}        {10mm}
\setlength{\headheight}       {15pt}
\setlength{\headsep}          {15pt}
\setlength{\textheight}       {230mm}
\setlength{\textwidth}        {150mm}
\setlength{\marginparsep}     {3mm}
\setlength{\marginparwidth}   {18mm}
%
\begin{document}
\begin{flushright}
% filled out be conference secratariat
Abstract \#000, \today
\end{flushright}
\begin{center}
{\large \bf
Dijet Cross Sections in Photoproduction and Determination
         of  the Gluon Density in the Photon
\\ }
\vspace{5mm}
M.~Erdmann$^1$
(for the H1 Collaboration)
\\
\vspace{5mm}
{\small\it
(1) University Karlsruhe / DESY, Notkestr. 85, D-22607 Hamburg, Germany
\\
}
\end{center}

Using data collected in 1996 by the H1 detector at the HERA collider
the differential di-jet cross section $d\sigma / dx_{\gamma}^{jets}$
is measured in photoproduction processes.
This cross section is sensitive to the gluon content of the photon at
small parton fractional momentum $x_{\gamma}$.
By extracting an effective parton density of the  quasi
real photon and using quark distributions as derived from 
$e^+e^-$ scattering, the gluon density
of the photon is determined in leading order QCD.  
This measurement leads to an
improved knowledge of the gluon content of the photon and covers the
kinematic range down to  $x_\gamma^{jets} = 0.04$.

\end{document}


