Impact of CLAS and COMPASS data on Polarized Parton Densities and Higher Twist

Abstract

We have re-analyzed the world data on inclusive polarized DIS including the very precise CLAS proton and deuteron data, as well as the latest COMPASS data on the asymmetry $A_1^d$, and have studied the impact of these data on polarized parton densities and higher twist effects. We demonstrate that the low $Q^2$ CLAS data improve essentially our knowledge of higher twist corrections to the spin structure function $g_1$, while the large $Q^2$ COMPASS data influence mainly the strange quark density. In our new analysis we find that a negative polarized gluon density, or one that changes sign as a function of x, cannot be ruled out from the present DIS data.

Version to be published in Phys. Rev. D., minor changes in the text, 2 figures and 2 references added

References in corpus (4)

• Determination of polarized parton distribution functions with recent data on polarization asymmetries
• Higher twists in polarized DIS and the size of the constituent quark
• Constraint on Δg(x) from π^0 production at RHIC
• Higher-twist analysis of moments of spin structure function

Cited by in corpus (28)

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• Extraction of Spin-Dependent Parton Densities and Their Uncertainties
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• Interplay of Spin and Orbital Angular Momentum in the Proton
• Determination of gluon polarization from deep inelastic scattering and collider data
• Experimental study of isovector spin sum rules
• Bjorken Sum Rule and pQCD frontier on the move
• Flavor Structure of the Nucleon Sea
• Determination of the Proton Spin Structure Functions for 0.05 < Q^2 < 5 GeV^2 using CLAS
• New analysis concerning the strange quark polarization puzzle
• Polarized DIS in N=4 SYM: Where is spin at strong coupling?
• A Possible Resolution of the Strange Quark Polarization Puzzle ?
• Flavor decomposition of the nucleon unpolarized, helicity and transversity parton distribution functions from lattice QCD simulations
• Study of spin-dependent structure functions of ${}^3\mathrm{He}$ and ${}^3\mathrm{H}$ at NNLO approximation and corresponding nuclear corrections
• Spin and orbital angular momentum of the proton
• The proton spin puzzle: where are we today ?
• Target mass corrections and higher twist effects in polarized deep-inelastic scattering
• Longitudinal polarization of hyperon and anti-hyperon in semi-inclusive deep-inelastic scattering
• Some Remarks on Methods of QCD Analysis of Polarized DIS Data
• Anti-Hyperon polarization in high energy pp collisions with polarized beams
• Nucleon electric dipole moment from polarized deep inelastic scattering
• Nucleon form factors and parton distributions in nonlocal chiral effective theory
• A new approach to calculate the gluon polarization
• Generalized parton distributions of sea quarks in the proton from nonlocal chiral effective theory
• Sensitivity of strange quark polarization to flavor SU(3) symmetry breaking
• Extraction of characteristic constants in QCD with perturbative and nonperturbative methods
• Target mass corrections to matrix elements in nucleon spin structure functions
• Nucleon spin structure functions, considering target mass correction and higher twist effects at the NNLO accuracy and their transverse momentum dependence