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%                         P H O T O N 9 9
%                          Freiburg
%                       May  23 - 27, 1999
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Abstract \#000, \today
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\begin{center}
{\large \bf
Charmonium Production in Deep Inelastic Scattering at HERA
\\ }
\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}
The electroproduction of $J/\psi$ and $\psi(2S)$ mesons is studied in elastic, quasi-elastic
and inclusive reactions for four momentum transfers $2<Q^2<80\mbox{~GeV}^2$
and photon-proton centre of mass energies $25 < W < 180\mbox{~GeV}$. The data
were taken with the H1 detector at the electron proton collider HERA in the years 1995 to 1997. 
The total virtual photon-proton cross section for elastic $J/\psi$ production
is measured as a function of $Q^2$ and $W$. The dependence of the
production rates on the square of the momentum transfer from the proton ($t$) 
is extracted. Decay angular distributions are analysed and the ratio of 
the longitudinal and transverse cross sections is derived.
The ratio of the cross sections for quasi-elastic $\psi(2S)$
and $J/\psi$ meson production is measured as a function of $Q^2$. 
The results are
discussed in terms of theoretical models based upon perturbative QCD. 
Differential cross sections for inclusive and inelastic production of 
$J/\psi$ mesons are determined and predictions within two theoretical
frameworks are compared with the data, the
non-relativistic QCD factorization approach including colour octet and
colour singlet contributions, and the model of Soft Colour Interactions.

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{\small\begin{description}
\item{[1]}
H1 Collaboration, C.Adloff et al., \\
DESY-99-026, submitted to Eur. Phys. J. C
\end{description}}

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