Assigning the imaginary poles of α_g1 to parton propagators produces long-distance damping e^{-Λ_s|x|/√2}|x|^{-5/2+d_a}, interpreting confinement as Green's-function suppression.
Experimental study of isovector spin sum rules
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abstract
We present the Bjorken integral extracted from Jefferson Lab experiment EG1b for $0.05<Q^{2}<2.92$ GeV$^2$. The integral is fit to extract the twist-4 element $f_{2}^{p-n}$ which appears to be relatively large and negative. Systematic studies of this higher twist analysis establish its legitimacy at $Q^{2}$ around 1 GeV$^{2}$. We also performed an isospin decomposition of the generalized forward spin polarizability $\gamma_{0}$. Although its isovector part provides a reliable test of the calculation techniques of Chiral Perturbation Theory, our data disagree with the calculations.
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Insight on confinement from the QCD effective charge
Assigning the imaginary poles of α_g1 to parton propagators produces long-distance damping e^{-Λ_s|x|/√2}|x|^{-5/2+d_a}, interpreting confinement as Green's-function suppression.