boson associated with a quark pair
in the fusion of two off-shell gluons. The quark component
is taken into account separately using the quark-gluon scaterring and quark-antiquark
annihilation QCD subprocesses. Special attention is put on the
contributions from the quarks involved into the earlier steps of the
evolution cascade. Using the Kimber-Martin-Ryskin formalism, we
simulate this component and demonstrate that it plays an important
role at both the Tevatron and LHC energies.
Our theoretical results are compared with recent
experimental data taken by the D
and CDF collaborations
at the Tevatron.
Key words: small-x physics, kT -factorization approach
