Eur. Phys. J. C 25, 41-53 (2002)
Inelastic leptoproduction of mesons at HERAThe H1 Collaboration
(Received: 21 May 2002 / Revised version: 16 June 2002 / Published online: 26 July 2002 )
The leptoproduction of mesons is studied in inelastic reactions for four momentum transfers . The data were taken with the H1 detector at the electron proton collider HERA and correspond to an integrated luminosity of . 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 fractional energy, z, which deviates significantly from that of the data. Comparisons with photoproduction are made and the polarisation of the produced meson is analysed.
© Società Italiana di Fisica, Springer-Verlag 2002