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- W2168524196 abstract "The theory of the ‘proton spin’ effect proposed in our earlier papers is extended to include the chiral SU(3) symmetry breaking and flavour mixing induced by non-vanishing quark masses in QCD. The theoretical basis is the derivation of exact, unified Goldberger-Treiman (GT) relations valid beyond the chiral limit. The observed suppression in the flavour singlet axial charge a0(Q2) is explained by an anomalously small value for the slope of the singlet current correlation function 〈0|T ϖμ Jμ50 ϖν Jν50|0〉, a consequence of the screening of topological charge i QCD vacuum. Numerical predictions are obtained by evaluating the current correlation functions using QCD spectral sum rules. The results, a0(Q2) = 0.31 ± 0.02 and ∫ dx g1p(x, Q2) = 0.141 ± 0.005 (at Q2 = 10 GeV2), are in good agreement with current experimental data on the polarised proton structure function g1p." @default.
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- W2168524196 date "1999-04-01" @default.
- W2168524196 modified "2023-10-16" @default.
- W2168524196 title "Topological charge screening and the ‘proton spin’ beyond the chiral limit" @default.
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- W2168524196 doi "https://doi.org/10.1016/s0550-3213(99)00061-9" @default.
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