2020 Impact factor 4.590
Particles and Fields
Eur. Phys. J. C 27, 219-228 (2003)
DOI: 10.1140/epjc/s2002-01107-1

The contribution of off-shell gluons to the longitudinal structure function FL

A.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 $\alpha_{\mathrm {s}}$. 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