Unintegrated parton distributions of pions and nucleons from the CCFM equations in the single-loop approximation

Abstract

The unintegrated quark and gluon distributions in the pion and nucleon are analysed using the CCFM equations in the single-loop approximation. We utilise the transverse-coordinate (or impact-parameter) representation which diagonalises the equations and study in detail the dependence on the transverse coordinate induced by the CCFM evolution. We find considerable broadening of the transverse-momentum distributions with an increasing magnitude of the hard scale, Q. For instance, at the Bjorken x=0.1 the root mean squared transverse momentum of the gluons is enhanced by about 1 GeV when evolved from the the initial low scale to Q^2=10 GeV^2, and by about 2 GeV when evolved up to Q^2=100 GeV^2. The broadening effect is enhanced with decreasing Bjorken x, and is stronger for the gluons than for the quarks. Analytic solution for the average transverse momentum corresponding to the x-moments of the distributions is obtained. The parton luminosities are also discussed.

References in corpus (29)

• Unintegrated parton distributions
• High-Energy Factorization and Small-X Deep Inelastic Scattering Beyond Leading Order
• QCD coherence in the structure function and associated distributions at small $x$
• Pionic Parton Distributions Revisited
• Hadronic final state predictions from CCFM: the hadron-level Monte Carlo generator CASCADE
• Can the Higgs be seen in rapidity gap events at the Tevatron or the LHC?
• Small x Phenomenology: Summary and Status
• Unintegrated parton distributions and prompt photon hadroproduction
• Double-diffractive processes in high-resolution missing-mass experiments at the Tevatron
• Role of the nonperturbative input in QCD resummed Drell-Yan $Q_T$-distributions
• The CCFM Monte Carlo generator CASCADE
• What exactly is a parton density?
• Anatomy of the differential gluon structure function of the proton from the experimental data on F_2p
• Unintegrated generalised parton distributions
• THE GLUON DISTRIBUTION AT SMALL x OBTAINED FROM A UNIFIED EVOLUTION EQUATION.
• The unintegrated gluon distribution from the CCFM equation
• Heavy Quark production at the TEVATRON and HERA using k_t-factorization with CCFM evolution
• Inelastic J/psi production at HERA in the colour singlet model with k_T-factorization
• Gluon Distribution Functions in the kT-factorization Approach
• Soft emissions and the equivalence of BFKL and CCFM final states
• The contribution of off-shell gluons to the longitudinal structure function F_L
• Unintegrated parton densities applied to heavy quark production in the CCFM approach
• CCFM prediction for F_2 and forward jets at HERA
• Heavy quark photoproduction in the semihard QCD approach and the unintegrated gluon distribution
• Structure functions and angular ordering at small x
• Heavy quark production in photon-nucleon and photon-photon collisions
• QCD coherence in deep inelastic scattering at small x at HERA
• BFKL and CCFM final states
• Diffractive Vector Meson Production in k_t-Factorization Approach

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• Geometric scaling violations in the central rapidity region of d+Au collisions at RHIC
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• Transverse momentum distributions of quarks in the nucleon from the Chiral Quark Soliton Model
• Partonic quasi-distributions of the proton and pion from transverse-momentum distributions
• Inclusive production of $J/\psi$ meson in proton-proton collisions at BNL RHIC
• Gluon transverse momenta and charm quark-antiquark pair production in $p-\bar{p}$ collisions at Tevatron
• Recent results on unintegrated parton distributions
• Resummation effects in Higgs boson transverse momentum distribution within the framework of unintegrated parton distributions
• Drell-Yan lepton pair production at LHC and TMD quark densities of the proton
• Nonphotonic electrons at RHIC within $k_t$-factorization approach and with experimental semileptonic decay functions
• Photon-jet correlations in $pp$ and $p\bar{p}$ collisions
• Unintegrated CCFM parton distributions and pion production in proton-proton collisions at high energies
• Charm quark-antiquark correlations in photon-proton scattering
• Unintegrated gluon distributions and Higgs boson production in proton-proton collisions
• Unintegrated CCFM parton distributions and transverse momentum of gauge bosons
• Pion production in d+Au collisions at RHIC energy
• Parton transverse momenta and Drell-Yan dilepton production
• Parton transverse momenta and direct photon production in hadronic collisions at high energies
• Dijet correlations at RHIC, leading-order $k_t$-factorization approach versus next-to-leading order collinear approach
• Solution of the Kwiecinski evolution equations for unintegrated parton distributions using the Mellin transform
• Generalized quasi, Ioffe-time, and pseudo quark distributions of the pion in the Nambu--Jona-Lasinio model
• Examination of $k_t$-factorization in a Yukawa theory
• Drell-Yan production with the CCFM-K evolution
• Unintegrated parton distributions and meson production in hadronic collisions
• Markovian MC simulation of QCD evolution at NLO level with minimum k_T
• Pion and Kaon Production in Nucleon - Nucleon Collisions
• Inclusive photon production and photon-jet correlations in hadronic collisions
• Unintegrated parton distributions and pion production in $pp$ collisions at SPS and RHIC energies