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\begin{titlepage}

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\begin{center}
{\large \bf H1prelim-03-071 } 
\end{center}
\vspace{1cm}

\begin{center}
\begin{Large}

{\bf  Photoproduction of {\boldmath $D^*$} Mesons at HERA}

\vspace{2cm}

H1 Collaboration

\end{Large}
\end{center}


\vspace{2cm}

\begin{abstract}
A measurement is presented of cross sections for $D^*$ Meson photoproduction at HERA. The measurement uses data taken with the H1 detector during the years 1999 to 2000. The cross sections are determined in the kinematical region $171 < W < 256 \ {\rm GeV}$, $Q^2 < 0.01 \ {\rm GeV^2}$, $P_t(D^*) > 2.5 \ {\rm GeV}$, and $|eta(D^*)| < 1.5$, where W is the $\gamma p$ center of mass energy. Photoproduction is assured through the detection of the scattered electron at small angles. In addition to total cross sections, the data are presented as a function of $P_t (D^*)$, $\eta (D^*)$ and $W$ and are compared with predictions from Monte Carlo programs in leading order and QCD calculations in fixed order (NLO). 
\end{abstract}

\vspace{1.5cm}

\begin{center}
Prepared for DIS 2003, St. Petersburg
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\flushleft

The kinematic range of the measurement is defined in table~\ref{kinrange}.
The total measured cross section for $ep \rightarrow e D^* X$ in this
range is (H1 99-00 preliminary):

\begin{eqnarray*}
\sigma_{vis} (ep \to e' D^* X)  = 4.74 \pm 0.32 \pm 0.64 \ {\rm nb} .
\end{eqnarray*}

This can be compared with the result from NLO QCD (fixed order, massive
scheme):

\begin{eqnarray*}
\sigma_{vis} (ep \to e' D^* X)  = 2.46^{+1.09}_{-0.60} \ {\rm nb} .
\end{eqnarray*}

\begin{table}
\begin{center}
\begin{tabular}{|c|c|}
  \hline
  \multicolumn{2}{|c|}{visible range}   \\ \hline
  $Q^2 $         & $< 0.01$ GeV$^2$           \\ 
  $W_{\gamma p}$ & $171<W_{\gamma p}<256$ GeV$^2$ \\ \hline
  $p_t (D^*)$   & $> 2.5$ GeV                 \\
  $\eta (D^*)$& $-1.5 < \eta  < 1.5$ \\
  \hline
\end{tabular}
\end{center}
\caption{Kinematic range of the measurement.}
\label{kinrange}
\end{table}


\begin{figure}
  \centering
    \includegraphics[width=\textwidth]{H1prelim-03-071.fig1.eps}
  \caption{$D^*$ signal in the form of the reconstructed
mass difference $M(D^*) - M(D^0)$.}
\end{figure}


\begin{figure}
  \begin{center}
    \includegraphics[width=0.9\textwidth]{H1prelim-03-071.fig2a.eps}
    \includegraphics[width=0.9\textwidth]{H1prelim-03-071.fig2b.eps}
  \end{center}
  \caption{$D^*$ photoproduction cross section as a function of the
$D^*$ transverse momentum, compared with (a) fixed order NLO calculations and
(b) LO Monte Carlo predictions.}
\end{figure}

\begin{figure}
  \begin{center}
    \includegraphics[width=0.9\textwidth]{H1prelim-03-071.fig3a.eps}
    \includegraphics[width=0.9\textwidth]{H1prelim-03-071.fig3b.eps}
  \end{center}
  \caption{$D^*$ photoproduction cross section as a function of the
$D^*$ pseudorapidity, compared with (a) fixed order NLO calculations and
(b) LO Monte Carlo predictions.} 
\end{figure}

\begin{figure}
  \begin{center}
    \includegraphics[width=0.9\textwidth]{H1prelim-03-071.fig4a.eps}
    \includegraphics[width=0.9\textwidth]{H1prelim-03-071.fig4b.eps}
  \end{center}
  \caption{$D^*$ photoproduction cross section as a function of the
$\gamma p$ centre of mass energy, 
compared with (a) fixed order NLO calculations and
(b) LO Monte Carlo predictions.} 
\end{figure}


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