The contribution of off-shell gluons to the longitudinal structure function FLA.V. Kotikov1, A.V. Lipatov2 and N.P. Zotov3
1 Bogoliubov Laboratory of Theoretical Physics, Joint Institute for Nuclear Research, 141980 Dubna, Russia
2 Department of Physics, Lomonosov Moscow State University, 119899 Moscow, Russia
3 Skobeltsyn Institute of Nuclear Physics, Lomonosov Moscow State University, 119992 Moscow, Russia
(Received: 21 August 2002 / Revised version: 31 October 2002 Published online: 24 January 2003 )
We present the results for the structure function FL for a gluon target having a non-zero transverse momentum square at order . The results of a double convolution (with respect to the Bjorken variable x and the transverse momentum) of the perturbative part and the unintegrated gluon densities are compared with recent experimental data for FL at low x values and with the predictions of other approaches.
© Società Italiana di Fisica, Springer-Verlag 2003