On the new COMPASS measurement of the deuteron spin-dependent structure function $g_1^d$

Abstract

Very recently, a new measurement of the deuteron spin-dependent structure function $g_1^d(x)$ was reported by the COMPASS group. A main change from the old SMC measurement is a considerable improvement of the statistical accuracy in the low $x$ region $0.004<x<0.03$. We point out that the new COMPASS data for $g_1^d(x)$ as well as their QCD fits for $\Delta \Sigma$ and $\Delta s+\Delta \bar{s}$ are all remarkably close to our theoretical predictions given several years ago based on the chiral quark soliton model.

arXiv commentErrors in Fig.4 were corrected. Version accepted for publication in Physics Letters B

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• The Spin Structure of the Nucleon
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• On the D-term of the nucleon generalized parton distributions
• Comparative analysis of the transversities and the longitudinally polarized distribution functions of the nucleon
• Quark spin content of the proton, hyperon semileptonic decays, and the decay width of the ${\Theta }^{+}$ pentaquark
• Extraordinary nature of the nucleon scalar charge and its densities as a signal of nontrivial vacuum structure of QCD