Production of two charm quark-antiquark pairs in single-parton scattering within the $k_t$-factorization approach

Abstract

We present first results for the $2\to 4$ single-parton scattering $gg\to c\bar{c}c\bar{c}$ subprocess for the first time fully within the $k_t$-factorization approach. In this calculation we have used the Kimber-Martin-Ryskin unintegrated gluon distribution which effectively includes some class of higher-order gluon emissions, and an off-shell matrix element squared calculated using recently developed techniques. The results are compared with our earlier result obtained within the collinear-factorization approach. Only slightly larger cross sections are obtained than in the case of the collinear approach. Inclusion of transverse momenta of gluons entering the hard process leads to a much stronger azimuthal decorrelation between $cc$ and $\bar{c}\bar{c}$ than in the collinear-factorization approach. A comparison to predictions of double parton scattering (DPS) results and the LHCb data strongly suggests that the assumption of two fully independent DPS ($gg\to c\bar{c}\otimes gg\to c\bar{c}$) may be too approximate.

arXiv comment14 pages, 12 figures

References in corpus (35)

• Unintegrated parton distributions
• An Algorithm to Compute Born Scattering Amplitudes without Feynman Graphs
• Color-flow decomposition of QCD amplitudes
• Observation of double charm production involving open charm in pp collisions at $\sqrt{s}$=7 TeV
• Color-dressed recursive relations for multi-parton amplitudes
• Open charm production at the LHC - $k_t$-factorization approach
• Helicity amplitudes for high-energy scattering
• On the computation of multigluon amplitudes
• Heavy Quark Production at High Energy
• Heavy quark production as sensitive test for an improved description of high energy hadron collisions
• Production of two $c\bar{c}$ pairs in double-parton scattering
• Multi-parton Cross Sections at Hadron Colliders
• Production of $c\bar{c}c\bar{c}$ in double-parton scattering within $k_t$-factorization approach -- meson-meson correlations
• Small-$x$ dynamics in forward-central dijet decorrelations at the LHC
• Wilson lines and gauge invariant off-shell amplitudes
• BCFW recursion for off-shell gluons
• Investigation of beauty production and parton shower effects at LHC
• Saturation effects in forward-forward dijet production in p+Pb collisions
• Heavy Flavour Production at Tevatron and Parton Shower Effects
• Gluon transverse momenta and charm quark-antiquark pair production in $p-\bar{p}$ collisions at Tevatron
• Single-parton scattering versus double-parton scattering in the production of two $c\bar{c}$ pairs and charmed meson correlations at the LHC
• Inclusive b-jet and b\bar b-dijet production at the LHC via Reggeized gluons
• Nonphotonic electrons at RHIC within $k_t$-factorization approach and with experimental semileptonic decay functions
• B-meson production in the Parton Reggeization Approach at Tevatron and the LHC
• Scalar Higgs boson production in a fusion of two off-shell gluons
• Associated production of prompt photons and heavy quarks in off-shell gluon-gluon fusion
• Phenomenology of kt-factorization for inclusive Higgs boson production at LHC
• Open charm production in the parton Reggeization approach: from Tevatron to LHC
• Polarization effects in double open-charm production at LHCb
• Heavy Quark Hadroproduction in $k_T$-Factorization Approach with Unintegrated Gluon Distributions
• HELAC-PHEGAS: automatic computation of helicity amplitudes and cross sections
• Kinematical correlations of dielectrons from semileptonic decays of heavy mesons and Drell-Yan processes at BNL RHIC
• Three jet production and gluon saturation effects in p-p and p-Pb collisions within high-energy factorization
• Production of two $c\bar{c}$ pairs in gluon-gluon scattering in high energy proton-proton collisions
• Inclusive production of Higgs boson in the two-photon channel at the LHC within $k_t$-factorization approach and with the Standard Model couplings

Cited by in corpus (18)

• On the mechanism of $T_{4c}(6900)$ tetraquark production
• Production of associated ${\rm Y}$ and open charm hadrons in $pp$ collisions at $\sqrt{s}=7$ and $8$TeV via double parton scattering
• Four-jet production in single- and double-parton scattering within high-energy factorization
• Consistent treatment of charm production in higher-orders at tree-level within $k_T$-factorization approach
• Calculations with off-shell matrix elements, TMD parton densities and TMD parton showers
• New mechanisms for double charmed meson production at the LHCb
• Quark correlations in the Color Glass Condensate: Pauli blocking and the ridge
• Large-p_T production of D mesons at the LHCb in the parton Reggeization approach
• Double scattering production of two positron-electron pairs in ultraperipheral heavy-ion collisions
• Charm quark and meson production in association with single-jet at the LHC
• Open charm production in Double Parton Scattering processes in the forward kinematics
• Double-parton scattering effects in associated production of charm mesons and dijets at the LHC
• Associated production of heavy quarkonium and $D-$meson in the improved color evaporation model with KaTie
• Double-parton scattering effects in $D^0{B}^{+}$ and $B^{+}{B}^{+}$ meson-meson pair production in proton-proton collisions at the LHC
• Production of forward heavy-flavour dijets at the LHCb within $k_T$-factorization approach
• Charmonium pair production at the LHCb in the ICEM using the $k_T$-factorization: DPS versus SPS
• What is the mechanism of the $T_{4c}(6900)$ tetraquark production?
• A short review of some double-parton scattering processes