Inelastic Leptoproduction of J/Psi Mesons at HERA
H1 Collaboration, C. Adloff
Abstract
The leptoproduction of J/psi mesons is studied in inelastic reactions for four momentum transfers 2<Q2<100GeV2. The data were taken with the H1 detector at the electron proton collider HERA and correspond to an integrated luminosity of 77 pb-1. Single differential and double differential cross sections are measured with increased precision compared with previous analyses. New leading order calculations within the non-relativistic QCD factorisation approach including colour octet and colour singlet contributions are compared with the data and are found to give a reasonable description of most distributions. An exception is the shape of the distribution in the J/psi fractional energy, z, which deviates significantly from that of the data. Comparisons with photoproduction are made and the polarisation of the produced J/psi meson is analysed.
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