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- W2059808423 abstract "The gluon polarization ΔG in a nucleon can be defined in a gauge invariant way as the integral over the Ioffe-time distribution of polarized gluons. We argue that for sufficiently regular polarized gluon distributions ΔG is dominated by contributions from small and moderate values of the Ioffe-time z ≲ 10. As a consequence ΔG can be estimated with 20% accuracy from the first two even moments of the polarized gluon distribution, and its behavior at small values of Bjorken x or, equivalently, at large Ioffe-times z . We employ this idea and compute the first two moments of the polarized gluon distribution within the framework of QCD sum rules. Combined with the color coherence hypothesis we obtain ΔG ≈ 2.1 ± 1.0 at a scale μ 2 ∼ 1 GeV 2 ." @default.
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- W2059808423 date "1997-03-01" @default.
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- W2059808423 title "Gluon polarization from QCD sum rules" @default.
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