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The contribution of off-shell gluons to the structure functions F2c and FLc$ and the unintegrated gluon distributions

A. V. Kotikov, A. V. Lipatov, G. Parente, N. P. Zotov

hep-pharXiv:hep-ph/0107135

Abstract

We calculate the perturbative parts of the structure functions F2c and FLc for a gluon target having nonzero transverse momentum squared at order αs. 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 HERA experimental data for F2c. The contribution from FLc structure function ranges (10-30)% of that of F2c at the kinematical range of HERA experiments.

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