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{\bf EPS-HEP99} \\
{\bf Abstract \# 000} \\
{\bf Parallel sessions: 3,5} \\
{\bf Plenary sessions:  3,5}
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\abstractheader{ {\bf 
Charmonium Production in Deep Inelastic Scattering at HERA  } \\ \\
H1 Collaboration, \\
DESY, Notkestr.85, D-22607 Hamburg, Germany
}

\abstractbody{
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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{\bf References }\\
1. H1 Collaboration, C.~Adloff {\it et al}, 
DESY-99-026, submitted to Eur. Phys. J. C

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