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

TL;DR

This paper models D meson production at the LHCb using the parton Reggeization approach, accurately predicting cross sections and correlations in proton-proton collisions at 7 and 13 TeV.

Contribution

It introduces a leading-order calculation of D meson production using the parton Reggeization approach with unintegrated PDFs and fragmentation functions fitted to e+e- data, achieving good agreement with experimental results.

Findings

Predictions agree well with LHCb data within uncertainties.

Cross sections and correlation spectra are accurately modeled.

The approach requires no free parameters for the data description.

Abstract

The production of D mesons in proton-proton collisions at the LHCb detector is studied. We consider the single production of D^0, D^+, D^star, and D_s^+ mesons and correlation spectra in the production of DbarD and DD pairs at the sqrt{S}=7 TeV and sqrt{S}=13 TeV. In case of the single D-meson production we calculate differential cross sections over transverse momentum p_T while in the pair DbarD,DD-meson production the cross sections are calculated over the azimuthal angle difference, rapidity difference, 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 unintegrated 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.