Large-pT production of D mesons at the LHCb in the parton Reggeization approach

The production of D mesons in proton-proton collisions at the LHCb detector is studied. We consider the single production of D-0/(D) over bar (0), D-+/- and D-s(+/-) mesons and correlation spectra in the production of D (D) over bar and DD pairs at the root 5 = 7 TeV and root s = 13 TeV. In case of the single D-meson production we calculate differential cross sections over transverse momentum while in the pair D (D) over bar, DD-meson production the cross sections are calculated over the azimuthal angle difference Delta phi, rapidity difference Delta y, invariant mass of the pair M and over the p(T) of the one meson from a pair. The cross sections are obtained at the leading order of the parton Reggeization approach using Kimber-Martin-Ryskin unintegmted parton distribution functions in a proton. To describe the D-meson production we use universal scale-dependent c-quark and gluon fragmentation functions fitted to e(+)e(-) annihilation data from CERN LEP1. Our predictions find a good agreement with the LHCb Collaboration data within uncertainties and without free parameters.