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Acknowledgements

Thank you to Veronica, Francesco and prof. Giulio D'Agostini that helped me preparing this note.

**Figure:** distribution. The data (dots) are compared to the MC simulation. Photoproduction background estimated by MC simulation (hatched histogram) is also shown. In addition the measured photoproduction events are shown as filled triangles.
$\begin{figure} \centerline{ \epsfig{figure=figure/php.eps,height=10cm,clip=}} \end{figure}$

Giulio D'Agostini 2004-05-05