Eur. Phys. J. C 10, 373-393
DOI 10.1007/s100529900138
Charmonium production in deep inelastic scattering at HERA
The H1 Collaboration
C. Adloff34 - et al.
34 Fachbereich Physik, Bergische Universität Gesamthochschule Wuppertal, Wuppertal, Germany
Received: 10 March 1999 / Published online: 8 September 1999
Abstract
The electroproduction of and mesons is studied in elastic, quasi-elastic
and inclusive reactions for four momentum transfers and photon-proton centre of mass energies . 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 production
is measured as a function of Q2 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 and meson production is measured as a function of Q2.
The results are
discussed in terms of theoretical models based upon perturbative QCD.
Differential cross sections for inclusive and inelastic production of
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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