Polarized Parton Distributions in the Nucleon

Abstract

The distribution of the spin of the nucleon among its constituents can be parametrized in the form of polarized parton distribution functions for quarks and gluons. Using all available data on the polarized structure function $g_1(x,Q^2)$, we determine these distributions both at leading and next-to-leading order in perturbation theory. We suggest three different, equally possible scenarios for the polarized gluon distribution, which is found to be only loosely constrained by current experimental data. We examine various possibilities of measuring polarized parton distributions at future experiments.

18 pages, LATEX, 6 figures available as .uu file

References in corpus (16)

• Global QCD Analysis and the CTEQ Parton Distributions
• The theory and phenomenology of polarized deep inelastic scattering
• Measurement of the Spin-Dependent Structure Function $g_1(x)$ of the Proton
• QCD Constrains on the Shape of Polarized Quark and Gluon Distributions
• Pinning down the Glue in the Proton
• Next-to-Leading Order Radiative Parton Model Analysis of Polarized Deep Inelastic Scattering
• Consistent Analysis of the Spin Content of the Nucleon
• On the Behaviour of Non--Singlet Structure Functions at Small $x$
• Spin-dependent Parton Distributions from Polarized Structure Function Data
• Scale Dependence and Small-x Behaviour of Polarized Parton Distributions
• The Spin Dependence of Diffractive Processes and Implications for the Small $x$ Behaviour of $g_1$ and the Spin Content of the Nucleon
• Radiative Parton Model Analysis of Polarized Deep Inelastic Lepton Nucleon Scattering
• The Gluon Density of the Proton at Low $x$ from a QCD Analysis of $F_2$
• The small $x$ behaviour of $g_1$
• Spin-dependent non-singlet structure functions in next-to-leading order
• Analytic Approaches to the Evolution of Polarised Parton Distributions at Small $x$

Cited by in corpus (171)

• Unraveling hadron structure with generalized parton distributions
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• Precision Determination of the Neutron Spin Structure Function g1n
• Spin Structure of the Proton from Polarized Inclusive Deep-Inelastic Muon-Proton Scattering
• Prospects for Spin Physics at RHIC
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• Spin Physics and Polarized Structure Functions
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• The Spin Structure of the Proton
• A Rederivation of the Spin-dependent Next-to-leading Order Splitting Functions
• Polarised Quark Distributions in the Nucleon from Semi-Inclusive Spin Asymmetries
• Polarized Parton Distribution Functions in the Nucleon
• Flavor Decomposition of the Polarized Quark Distributions in the Nucleon from Inclusive and Semi-inclusive Deep-inelastic Scattering
• Moments of Nucleon Light Cone Quark Distributions Calculated in Full Lattice QCD
• Towards a fitting procedure for deeply virtual Compton scattering at next-to-leading order and beyond
• Measurement of the Spin Asymmetry in the Photoproduction of Pairs of High-pT Hadrons at HERMES
• Next-to-Leading Order QCD Analysis of Polarized Deep Inelastic Scattering Data
• Measurement of the $x$- and $Q^2$-Dependence of the Asymmetry $A_1$ on the Nucleon
• Study of the Fundamental Structure of Matter with an Electron-Ion Collider
• Determination of polarized parton distribution functions and their uncertainties
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• The gluon spin contribution to the proton spin from the double helicity asymmetry in inclusive pi^0 production in polarized p+p collisions at sqrt(s)=200 GeV
• Determination of gluon polarization from deep inelastic scattering and collider data
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• Target mass effects in polarized deep-inelastic scattering
• Leading twist asymmetries in deeply virtual Compton scattering
• Deeply virtual Compton scattering off nuclei
• Nucleon structure with two flavors of dynamical domain-wall fermions
• Determination of polarized parton distribution functions with recent data on polarization asymmetries
• Leading and higher twists in the proton polarized structure function at large Bjorken x
• A next-to-leading order QCD analysis of deeply virtual Compton scattering amplitudes
• Polarized Parton Densities in the Nucleon
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• Probing generalized parton distributions in pi N -> l+ l- N
• Hard exclusive meson production at next-to-leading order
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• Photoproduction of Heavy Quarks in Next-to-Leading Order QCD with Longitudinally Polarized Initial States
• Single-spin asymmetries with weak bosons at RHIC
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• Renormalon Model Predictions for Power-Corrections to Flavour Singlet Deep Inelastic Structure Functions
• Next-to-Leading Order QCD Corrections to the Polarized Photoproduction of Heavy Flavors
• Measurements of $d_2^n$ and $A_1^n$: Probing the neutron spin structure
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• The $Q^2$ evolution of Soffer inequality
• Polarized Parton Distributiions and Light-Front Dynamics
• Jet cross sections in polarized photon-hadron collisions
• Generalized Gerasimov-Drell-Hearn Sum Rule for the Proton-Neutron Difference in Chiral Perturbation Theory
• Charmonium production in polarized high-energy collisions
• Next-to-Leading Order QCD Corrections to the Polarized Hadroproduction of Heavy Flavors
• Gluon distributions in the proton in a light-front spectator model
• Numerical solution of Q^2 evolution equation for the transversity distribution Delta_T q
• QCD corrections to the longitudinally polarized Drell-Yan process
• QCD analysis of polarized DIS and the SIDIS asymmetry world data and light sea-quark decomposition
• QCD Corrections to Double and Single Spin Asymmetries in Vector Boson Production at Polarized Hadron Colliders
• Nonvanishing tensor polarization of sea quarks in polarized deuterons
• Reassessment of the Collins Mechanism for Single-spin Asymmetries and the behavior of Delta d(x) at large x
• Next-to-leading order evolution of generalized parton distributions for HERA and HERMES
• Drell-Yan forward-backward and spin asymmetries for arbitrary vector boson production at next-to-leading order
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• Probing Polarized Parton Distributions with Meson Photoproduction
• Quark Distributions of Octet Baryons from SU(3) Symmetry
• Statistical approach for unpolarized fragmentation functions for the octet baryons
• QCD expectations for the spin structure function $g_1$ in the low $x$ region
• Gluon distributions and their applications to Ioffe-time distributions
• Proton-deuteron asymmetry in Drell-Yan processes and polarized light-antiquark distributions
• A lattice determination of the second moment of the polarised valence quark distribution
• A Precision Measurement of the Neutron Twist-3 Matrix Element $d_2^n$: Probing Color Forces
• Hadron plus photon production in polarized hadronic collisions at next-to-leading order accuracy
• Polarized rho mesons and the asymmetry between Delta d^bar(x) and Delta u^bar(x) in the sea of the nucleon
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• Nucleon structure functions with domain wall fermions
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• Double-Spin Asymmetry of J/psi Production in Polarized pp Collisions at HERA-$\vec{N}$
• Next-to-Leading Order Corrections to Heavy Flavour Production in Longitudinally Polarized Photon-Nucleon Collisions
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• The Role of Polarized Valons in the Flavor Symmetry Breaking of Nucleon Sea
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• Next-to-leading order QCD corrections to hadron+jet production in pp collisions at RHIC
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• Spin Dependence of Massive Lepton Pair Production in Proton-Proton Collisions
• Neutron spin-dependent structure function, Bjorken sum rule, and first evidence for singlet contribution at low $x$
• A Monte Carlo for POLarized (semi-inclusive) Deep Inelastic Scattering
• Longitudinal polarization of hyperon and anti-hyperon in semi-inclusive deep-inelastic scattering
• Remarks on Next-to-Leading Order Analysis of Polarized Deep Inelastic Scattering Data
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• Isolated Photons at Hadron Colliders at O(αalpha_s^2) (II): Spin Dependent Case
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• Spin Asymmetries in Squark and Gluino Production at Polarized Hadron Colliders
• Inclusive Prompt Photon Production in Polarized pp Collisions at HERA-N
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• A Semianalytical Method to Evolve Parton Distributions
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• Spin Physics
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• Soft Gluon Resummation for Polarized Deep-inelastic Production of Heavy Quarks
• Polarized Photoproduction of Heavy Quarks in Next-to-Leading Order
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• Measurements of double-helicity asymmetries in inclusive $J/\psi$ production in longitudinally polarized $p+p$ collisions at $\sqrt{s}=510$ GeV
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• A positivity bound for the longitudinal gluon distribution in a nucleon
• Spin constraints on Regge predictions and perturbative evolution in high energy collisions
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• Lepton Helicity Distributions in Polarized Drell-Yan Process
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• Leading log radiative corrections to polarized heavy flavour leptoproduction
• Diffraction driven steep rise of spin structure function $g_{LT}=g_1+g_2$ at small x and DIS sum rules
• Double Spin Asymmetries in P-wave Charmonium Hadroproduction
• Conatraints on $\Delta G$ from Prompt Photon plus Jet Production at HERA-$\vec{N}$
• Spin Dependence of Associated Production of a Prompt Photon and a Charm Quark at Next-to-Leading Order in QCD
• Polarized photoproduction of large-p_T hadron pairs as a probe of the polarized gluon distribution
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• Comparison of the fits to data on polarised structure functions and spin asymmetries
• Polarization phenomena in open charm photoproduction processes
• QCD corrections to longitudinal spin asymmetries in $W^{\pm }$-boson production at RHIC
• Analyzing the nucleon spin in weak interaction processes at HERA energies
• An analysis of polarized parton distribution functions with nonlinear QCD evolution equations
• Two-Spin Asymmetry for ${\psi }^{\prime }$ Photoproduction with Color-Octet Mechanism
• Color Octet Contribution to J/psi Photoproduction Asymmetries
• Detect ΔG at BNL-RHIC via Double Quarkonium Production
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• Magnetic and axial vector form factors as probes of orbital angular momentum in the proton
• Spin effects in diffractive $Q\bar{Q}$ production at BNL eRHIC
• Direct Estimate of the Gluon Polarization in the Nucleon
• Spin physics with STAR
• Recent STAR results in high-energy polarized proton-proton collisions at RHIC
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• An Alternative Method to Obtain the Quark Polarization of the Nucleon
• Quarkonium Production through Hard Comover Rescattering in Polarized and Unpolarized pp Scattering
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