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.

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

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• Spin Structure of the Nucleon - Status and Recent Results
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• The Spin Structure of the Nucleon
• Interplay of Spin and Orbital Angular Momentum in the Proton
• Determination of gluon polarization from deep inelastic scattering and collider data
• Flavour Separation of Helicity Distributions from Deep Inelastic Muon-Deuteron Scattering
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• What can break the Wandzura--Wilczek relation?
• Bjorken Sum Rule and pQCD frontier on the move
• Nucleon spin structure and pQCD frontier on the move
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• Flavor Structure of the Nucleon Sea
• Beam-Target Double Spin Asymmetry A_LT in Charged Pion Production from Deep Inelastic Scattering on a Transversely Polarized He-3 Target at 1.4<Q^2<2.7 GeV^2
• Determination of the Proton Spin Structure Functions for 0.05 < Q^2 < 5 GeV^2 using CLAS
• Renormalization of Twist-Four Operators in QCD
• New analysis concerning the strange quark polarization puzzle
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• Understanding the proton's spin structure
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• A Possible Resolution of the Strange Quark Polarization Puzzle ?
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• Nucleon spin structure functions at NNLO in the presence of target mass corrections and higher twist effects
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• Threshold resummation for polarized (semi-)inclusive deep inelastic scattering
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• Extraction of characteristic constants in QCD with perturbative and nonperturbative methods
• QCD corrections to longitudinal spin asymmetries in $W^{\pm }$-boson production at RHIC
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• Target mass corrections to matrix elements in nucleon spin structure functions
• The Jlab Upgrade - Studies of the Nucleon with CLAS12
• Nucleon spin structure functions, considering target mass correction and higher twist effects at the NNLO accuracy and their transverse momentum dependence
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