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\newcommand{\ap}{\alpha_{\mathbb{P}}}
\newcommand{\Jpsi}{$J/\psi$ }
\newcommand{\jpsi}{J/\psi}
\newcommand{\mup}{\mu^+}
\newcommand{\mum}{\mu^-}
\newcommand{\ra}{\rightarrow}
\newcommand{\pb}{\;\rm pb}

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\begin{document}

\renewcommand{\deg}{\ensuremath{\,^\mathrm{o}} }
\newcommand{\qsq}{\ensuremath{Q^2} }
\newcommand{\gevsq}{\ensuremath{\;\mathrm{GeV}^2} }
\newcommand{\gev}{\ensuremath{\;\mathrm{GeV}} }
\newcommand{\gp}{\ensuremath{\gamma p} }
\newcommand{\wgp}{\ensuremath{\rm{W}_{\gamma p}} }
\newcommand{\ptpsq}{\ensuremath{\rm{p}_{t,\psi}^2} }

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\begin{titlepage}

\noindent
\hfill H1prelim-03-075
 
\noindent
%%%Version:     1.0 (April 11, 2003) \\
%%%Editor:      P.~Fleischmann \\
%%%Referees:    D.~Brown, T.~Naumann \\
 
\vspace{2cm}
\begin{center}
  \begin{Large}
    {\bf Elastic Photoproduction of \boldmath\Jpsi Mesons}\\
    \vspace{2cm}
    H1 Collaboration
  \end{Large}
\end{center}
\vspace{2cm}

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\begin{abstract}
  \noindent
  The elastic \Jpsi cross section is measured in the kinematic region
  $\qsq<1\gevsq$, $40\gev<\wgp<150\gev$ and $|t|<1.2\gevsq$ using the decay
  channel $\jpsi\ra\mup\mum$. The analysis is based on an integrated
  luminosity of $\mathcal{L}=54.8\pb^{-1}$. Single and double
  differential cross sections are measured as a function of \wgp and $|t|$
  and are compared to calculations in perturbative QCD.
\end{abstract}
 
\vspace{1.5cm}
\begin{center}
  Prepared for DIS 2003, St. Petersburg
\end{center}

\end{titlepage}

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\begin{figure}[p]
    \includegraphics[width=0.9\textwidth,height=\textheight,keepaspectratio]{h1prelim-03-075.fig1.eps}
    \caption{The elastic cross section $\sigma_{\gp}$ as a function of
      \wgp. The inner (outer) bars give the statistical (total) error. The
      data from the process $\jpsi\ra e^+ e^-$ are those from
      \cite{Adloff:2000vm}, corrected due to a wrong branching ratio, which
      had been used. The fit is applied to both data sets, allowing different
      normalisation factors.}
    \label{fig:wxsec1}
\end{figure}

\begin{figure}[p]

  \includegraphics[width=0.9\textwidth,height=\textheight,keepaspectratio]{h1prelim-03-075.fig2.eps}
  \caption{The elastic cross section $\sigma_{\gp}$ as a function of
    \wgp. The inner (outer) bars give the statistical (total) error. The
    experimental data \cite{Binkley:1982kv,Denby:1984az,Chekanov:2002xi} are
    compared to some QCD models
    \cite{Lai:1997mg,Martin:1998sq,Lai:1999wy,Caldwell:2001ky}.}
    \label{fig:wxsec2}
\end{figure}

\begin{figure}[p]
    \includegraphics[width=0.9\textwidth,height=\textheight,keepaspectratio]{h1prelim-03-075.fig3.eps}
    \caption{The effective pomeron trajectory $\ap$ as a function of
      $|t|$. The inner (outer) bars give the statistical (total) error. A
      straight line is fitted to the H1 data, which shows shrinkage as a
      three sigma effect. The ZEUS data are from \cite{Chekanov:2002xi}.}
    \label{fig:alpha}
\end{figure}

\begin{figure}[p]
    \includegraphics[width=0.9\textwidth,height=\textheight,keepaspectratio]{h1prelim-03-075.fig4.eps}
    \caption{The differential cross section $d\sigma/dt$ as a function of
      $|t|$. The inner (outer) bars give the statistical (total) error. A fit
      of the form $d\sigma/dt\propto e^{bt}$ is shown as solid line in the
      applied fit range ($0.07\gev^2$ - $1.2\gev^2$) and as dotted line
      outside.}
    \label{fig:txsec}
\end{figure}

\begin{figure}[p]
    \includegraphics[width=0.9\textwidth,height=\textheight,keepaspectratio]{h1prelim-03-075.fig5.eps}
    \caption{The slope parameter $b$ derived from a fit to the differential
      crossection $d\sigma/dt\propto e^{bt}$ as a function of \wgp. The inner
      (outer) bars give the statistical (total) error. A fit to the H1 data
      is shown as  solid line in the applied fit range ($40\gev$ - $150\gev$)
      and as dotted line outside. The ZEUS data are from
      \cite{Chekanov:2002xi}.}
    \label{fig:bslope}
\end{figure}

\bibliographystyle{H1prelim-03-075}
\bibliography{H1prelim-03-075}

\end{document}

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