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Cheng, Ta-Pei; Kochelev, Nikolai; Vento Torres, Vicente | |||
Aquest document és un/a article, creat/da en: 1999 | |||
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The recent suggestion of a vanishing flavor-singlet axial-charge of nucleon due to a nontrivial vacuum structure is further amplified. A perturbative QCD discussion, applicable for the heavy quark contributions, relates it to the physics of the decoupling theorem. It is also shown that leads to a negative η′-meson-quark coupling, which has been found to be compatible with the chiral quark model phenomenology. | |||
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