The contribution of off-shell gluons to the structure functions F2c and FLc and the unintegrated gluon distributionsA.V. Kotikov1, A.V. Lipatov2, G. Parente3 and N.P. Zotov4
1 Bogoliubov Laboratory of Theoretical Physics, Joint Institute for Nuclear Research, 141980 Dubna, Russia
2 Department of Physics, M.V. Lomonosov Moscow State University, 119899 Moscow, Russia
3 Departamento de Física de Partículas, Universidade de Santiago de Compostela, 15706 Santiago de Compostela, Spain
4 D.V. Skobeltsyn Institute of Nuclear Physics, M.V. Lomonosov Moscow State University, 119899 Moscow, Russia
(Received: 18 April 2002 / Revised version: 24 July 2002 / Published online: 7 October 2002 )
We calculate the perturbative parts of the structure functions F2c and FLc for a gluon target having non-zero transverse momentum squared at order . The results of the double convolution (with respect to the Bjorken variable xB and the transverse momentum) of the perturbative part and the unintegrated gluon densities are compared with the HERA experimental data for F2c. The contribution from the FLc structure function ranges in 10- of that of F2c at the kinematical range of the HERA experiments.
© Società Italiana di Fisica, Springer-Verlag 2002