Polarized Parton Densities in the Nucleon

Abstract

We present a critical assessment of what can be learnt from the present data on inclusive polarized DIS. We examine critically some of the simplifying assumptions made in recent analyses and study in detail the question of the determination of the gluon, strange sea and valence quark polarized densities. We have also carried out a new NLO QCD analysis of the world data. We find an excellent fit to the data and present our results for the polarized parton densities.

21 pages, LaTeX file, 10 figures appended as 10 separate ps files. Paper submitted to Phys. Rev. D. and presented at ICHEP98, Vancouver, Canada and XIV Int. Seminar on HEP Problems "Relativistic Nuclear Physics and Quantum Chromodynamics", 1998, Dubna, Russia

References in corpus (24)

• The theory and phenomenology of polarized deep inelastic scattering
• Precision Determination of the Neutron Spin Structure Function g1n
• Measurement of the Spin-Dependent Structure Function $g_1(x)$ of the Proton
• Measurement of the Neutron Spin Structure Function $g_1^n$ with a Polarized ^3He Target
• Deep Inelastic Scattering of Polarized Electrons by Polarized ${}^3$He and the Study of the Neutron Spin Structure
• Next-to-Leading Order Radiative Parton Model Analysis of Polarized Deep Inelastic Scattering
• Spin Structure of the Proton from Polarized Inclusive Deep-Inelastic Muon-Proton Scattering
• Polarized Parton Distributions in the Nucleon
• The Calculation of the Two-Loop Spin Splitting Functions $P_{ij}^{(1)}(x)$
• Determination of the Bjorken Sum and Strong Coupling from Polarized Structure Functions
• A Rederivation of the Spin-dependent Next-to-leading Order Splitting Functions
• Polarised Quark Distributions in the Nucleon from Semi-Inclusive Spin Asymmetries
• Measurements of the Proton and Deuteron Spin Structure Function g2 and Asymmetry A2
• Flavor Singlet Contribution to the Structure Function $g_1$ at Small-x
• A Next-to-Leading Determination of the Singlet Axial Charge and the Polarized Gluon Content of the Nucleon
• Next-to-Leading Order QCD Analysis of Polarized Deep Inelastic Scattering Data
• Spin Asymmetry in Muon--Proton Deep Inelastic Scattering on a Transversely-Polarized Target
• Measurements of the Q2-Dependence of the Proton and Deuteron Spin Structure Functions g1p and g1d
• Measurement of the Neutron Spin Structure Function g2n and Asymmetry A2n
• Scale Dependence and Small-x Behaviour of Polarized Parton Distributions
• Next-to-Leading Order Analysis of Inclusive and Semi-inclusive Polarized Data
• Polarized Quarks, Gluons and Sea in Nucleon Structure Functions
• Non-local generalization of the axial anomaly and $x$-dependence of the anomalous gluon contribution
• Remarks on Next-to-Leading Order Analysis of Polarized Deep Inelastic Scattering Data

Cited by in corpus (41)

• Hard Exclusive Reactions and the Structure of Hadrons
• The Spin Structure of the Nucleon
• Models for the Polarized Parton Distributions of the Nucleon
• Deeply virtual electroproduction of photons and mesons on the nucleon : leading order amplitudes and power corrections
• Prospects for Spin Physics at RHIC
• Spin Physics and Polarized Structure Functions
• Spin Structure of the Nucleon - Status and Recent Results
• Polarized Parton Distribution Functions in the Nucleon
• Determination of polarized parton distribution functions and their uncertainties
• Measurement of Deeply Virtual Compton Scattering with a Polarized Proton Target
• The Spin Structure of the Nucleon
• DVCS on the nucleon : study of the twist-3 effects
• Hard exclusive electroproduction of decuplet baryons in the large N_c limit
• Impact of hadronic and nuclear corrections on global analysis of spin-dependent parton distributions
• Inclusive and Semi-Inclusive Polarized DIS Data Revisited
• Next-to-leading order jet cross sections in polarized hadronic collisions
• Scheme Dependence in Polarized Deep Inelastic Scattering
• A New Study of the Polarized Parton Densities in the Nucleon
• The Jacobi Polynomials QCD analysis for the polarized structure function
• Polarized Parton Distributiions and Light-Front Dynamics
• Polarized Deeply Inelastic Scattering (DIS) Structure Functions for Nucleons and Nuclei
• On the Role of Higher Twist in Polarized Deep Inelastic Scattering
• Pion production in deeply virtual Compton scattering
• New anomalous trajectory in Regge theory
• QCD analysis of polarized DIS and the SIDIS asymmetry world data and light sea-quark decomposition
• Reassessment of the Collins Mechanism for Single-spin Asymmetries and the behavior of Delta d(x) at large x
• On the Sensitivity of the Polarized Parton Densities to Flavour SU(3) Symmetry Breaking
• The QCD analysis of the combined set for the F_3 structure function data based on the analytic approach
• Proton-deuteron asymmetry in Drell-Yan processes and polarized light-antiquark distributions
• Polarized Parton Distributions in the Photon and Factorization Scheme Dependence
• NLO QCD procedure of the semi-inclusive deep inelastic scattering data analysis with respect to the light quark polarized sea
• Exclusive channels in semi-inclusive production of pions and kaons
• The Role of Polarized Valons in the Flavor Symmetry Breaking of Nucleon Sea
• A Strategy for the Analysis of Semi-Inclusive Deep Inelastic Scattering
• A QCD Analysis of Polarised Parton Densities
• Gluon polarization in the proton
• Magnetic moments of octet baryons and sea antiquark polarizations
• Sensitivity of strange quark polarization to flavor SU(3) symmetry breaking
• Comparison of the fits to data on polarised structure functions and spin asymmetries
• Polarized Gluon Distribution Function from ${\eta }^{\prime }$ Production
• Extraction of Polarized Gluon Distributions from Large-pt Light Hadron Pair Production