  We study the inclusive DbarD and DD pair production in proton-proton
collisions at the LHC at lead- ing order of the parton Reggeization approach
endowed with universal scale-depended fragmen- tation functions for c-quark to
D-meson and for gluon to D-meson transitions. We have described DbarD and DD
distributions in azimuthal angle, as well as transverse momentum, rapidity
distance, and invariant mass measured in the region of large rapidity 2 < y < 4
by the LHCb Collabora- tion at the LHC without free parameters. We have used
Reggeized amplitudes for the processes RR - gg and RR - c barc which are
obtained accordingly to Feynman rules of the L.N. Lipatov effective theory of
Reggeized partons, and Kimber-Martin-Ryskin model for unintegrated gluon
distribution function in a proton with Martin-Stirling-Thorne-Watt collinear
parton distributions as inputs.
