Subdominant terms in the production of $c\bar{c}$ pairs in proton-proton collisions

Abstract

At high-energies the gluon-gluon fusion is the dominant mechanism of $c\bar{c}$ production. This process was calculated in the NLO collinear as well as in the k${}_t$-factorization approaches in the past. We show that the present knowledge of gluon distributions does not allow to make a precise predictions for $c\bar{c}$ production at LHC, in particular at forward rapidities. In this paper we study production of $c\bar{c}$ pairs including several subleading mechanisms. This includes: $gg\to Q\bar{Q}$, $\gamma g\to Q\bar{Q}$, $g\gamma \to Q\bar{Q}$, $\gamma \gamma \to Q\bar{Q}$. In this context we use MRST-QED parton distributions which include photon as a parton in the proton as well as elastic photon distributions calculated in the equivalent photon approximation. We present distributions in the $c$ quark ($\bar{c}$ antiquark) rapidity and transverse momenta and compare them to the dominant gluon-gluon fusion contribution. We discuss also inclusive single and central diffractive processes using diffractive parton distribution found from the analysis of HERA diffractive data. As in the previous case we present distribution in $c$ ($\bar{c}$) rapidity and transverse momentum. Finally we present results for exclusive central diffractive mechanism discussed recently in the literature. We show corresponding differential distributions and compare them with corresponding distributions for single and central diffractive components.

20 pages, 19 figures

References in corpus (16)

• Parton distributions for the LHC
• Dynamical parton distributions of the nucleon and very small-x physics
• Central Exclusive Particle Production at High Energy Hadron Colliders
• Studying the MSSM Higgs sector by forward proton tagging at the LHC
• Central exclusive production of scalar χ_c meson at the Tevatron, RHIC and LHC energies
• Elastic double diffractive production of axial-vector χ_c(1^{++}) mesons and the Landau-Yang theorem
• Nonphotonic electrons at RHIC within $k_t$-factorization approach and with experimental semileptonic decay functions
• An estimation of single and double diffractive heavy flavour production in hadron-hadron colliders
• Diffractive hadroproduction of W and Z bosons at high energies
• Central exclusive quark-antiquark dijet and Standard Model Higgs boson production in proton-(anti)proton collisions
• Estimate of the single diffractive heavy quark production in heavy ion collisions at the CERN-LHC
• Kinematical correlations of dielectrons from semileptonic decays of heavy mesons and Drell-Yan processes at BNL RHIC
• Uncertainties on exclusive diffractive Higgs and jets production at the LHC
• One-loop gg->bb(bar) effects in the main irreducible background to exclusive H->bb(bar) production at the LHC
• Inclusive and exclusive diffractive production of dilepton pairs in proton-proton collisions at high energies
• Estimations for the Single Diffractive production of the Higgs boson at the Tevatron and the LHC

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