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In the framework of the kt-factorization approach, the production ofunpolarized Drell-Yan lepton pair at high energies is studied. Theconsideration is based on the O(alpha) and $O(alpha alpha_s) off-shell partonicmatrix elements with virtual photon and Z boson exchange. The calculationsinclude leptonic decays of Z bosons with full spin correlations as well asgamma - Z interference. The unintegrated parton densities in a proton aredetermined by the Kimber-Martin-Ryskin prescription. Our numerical predictionsare compared with the data taken by the D0, CDF and CMS collaborations at theTevatron and LHC energies. Special attention is put on the specific angulardistributions measured very recently by the CDF collaboration for the firsttime.

Drell-Yan lepton pair production at high energies in the kt-factorization approach