NLO QCD Analysis of Polarized Deep Inelastic Scattering

Abstract

We have carried out a NLO analysis of the world data on polarized DIS in the MS/bare scheme. We have studied two models of the parametrizations of the input parton densities, the first due to Brodsky, Burkhardt and Schmidt (BBS) which gives a simultaneous parametrization for both the polarized and unpolarized densities and in which the counting rules are strictly imposed, the second in which the input polarized densities are written in terms of the unpolarized ones in the generic form Deltaq(x)=f(x)q(x) with f(x) some simple smooth function. In both cases a good fit to the polarized data is achieved. As expected the polarized data do not allow a precise determination of the polarized gluon density. Concerning the polarized sea-quark densities, these are fairly well determined in the BBS model because of the interplay of polarized and unpolarized data, whereas in the second model, where only the polarized data are relevant, the polarized sea-quark densities are largely undetermined.

21 pages, LaTeX, 9 figures as ps files

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• Precision Determination of the Neutron Spin Structure Function g1n
• Measurement of the Spin-Dependent Structure Function $g_1(x)$ of the Proton
• QCD Constrains on the Shape of Polarized Quark and Gluon Distributions
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• 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
• Scale Dependence and Small-x Behaviour of Polarized Parton Distributions
• Once More on the Radiative Corrections to the Nucleon Structure Functions in QCD

Cited by in corpus (41)

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• Effect of Orbital Angular Momentum on Valence-Quark Helicity Distributions
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• Constraints on spin-dependent parton distributions at large x from global QCD analysis
• Nucleon spin structure functions at NNLO in the presence of target mass corrections and higher twist effects
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• Polarized Parton Distributiions and Light-Front Dynamics
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• On the Role of Higher Twist in Polarized Deep Inelastic Scattering
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• Analytical approaches to the determination of spin-dependent parton distribution functions at NNLO approximation
• Small- and large-x nucleon spin structure from a global QCD analysis of polarized Parton Distribution Functions
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• Comparative study of nuclear effects in polarized electron scattering from 3He
• Lambda and Lambda-bar polarization in polarized DIS
• Azimuthal Spin Asymmetries in Semi-Inclusive Production from Positron-Proton Scattering
• The Role of Polarized Valons in the Flavor Symmetry Breaking of Nucleon Sea
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• Next-to-leading order QCD corrections to single-inclusive hadron production in transversely polarized p-p and pbar-p collisions
• Impact of recent COMPASS data on polarized parton distributions and structure functions
• An approach to NLO QCD analysis of the semi-inclusive DIS data with modified Jacobi polynomial expansion method
• Magnetic moments of octet baryons and sea antiquark polarizations
• Polarized Structure Functions in the Valence Quark and Resonance Regions and the GDH Sum
• QCD spin physics: status, and prospects for RHIC
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• QCD predictions for spin dependent photonic structure function $g_1^{\gamma }(x,Q^2)$ in the low x region of future linear colliders
• Re-examining valence quark spin distributions
• Polarized lepton nucleon scattering -- summary of the theory talks on spin physics at DIS 99
• Nucleon spin structure functions, considering target mass correction and higher twist effects at the NNLO accuracy and their transverse momentum dependence