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• W2008001935 abstract "The violation of SU(2${)}_{mathit{f}}$ symmetry in the nucleon's light sea (uifmmodebarelsetextasciimacronfi{}ensuremath{ne}difmmodebarelsetextasciimacronfi{}) is analyzed within the framework of the effective chiral quark field theory ``matched'' to the QCD-improved parton model: At some ad hoc ``matching'' scale ${mathit{Q}}_{0}^{2}$, effective chiral quark fields are associated with QCD valence quark partons and a prediction on the SU(2${)}_{mathit{f}}$-violating nonsinglet structure function x(difmmodebarelsetextasciimacronfi{}-uifmmodebarelsetextasciimacronfi{}) is deduced from chiral field theory. A simpler model is also presented, which essentially reproduces the chiral result. The sensitivity of x(difmmodebarelsetextasciimacronfi{}-uifmmodebarelsetextasciimacronfi{}) to the choice of the ``matching'' scale ${mathit{Q}}_{0}^{2}$ is investigated. It is shown that the effective chiral quark field theory cannot explain the experimentally observed NA51 Drell-Yan measurement uifmmodebarelsetextasciimacronfi{}/difmmodebarelsetextasciimacronfi{}=0.51ifmmodepmelsetextpmfi{}0.06 at x=0.18, ${mathit{Q}}^{2}$ensuremath{simeq}27 ${mathrm{GeV}}^{2}$, since the predicted shape of x(difmmodebarelsetextasciimacronfi{}-uifmmodebarelsetextasciimacronfi{}) is concentrated in the very small x region, with ${mathit{Q}}_{0}^{2}$ restricted to perturbatively accessible values." @default.
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• W2008001935 creator A5020354541 @default.
• W2008001935 date "1995-09-01" @default.
• W2008001935 modified "2023-10-14" @default.
• W2008001935 title "SU(2)fviolation in the nucleon’s light sea within the framework of the effective chiral quark theory" @default.
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• W2008001935 doi "https://doi.org/10.1103/physrevd.52.2701" @default.
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