Further Comments on a Vanishing Singlet Axial Vector Charge

Details Further Comments on a Vanishing Singlet Axial Vector Charge Further Comments on a Vanishing Singlet Axial Vector Charge

1998-12-18

arxiv.org/abs/hep-ph/9812438v1

Mod.Phys.Lett. A14 (1999) 205-210

Physics

High Energy Physics

High Energy Physics - Phenomenology

6 pages, Latex

Scientific paper

10.1142/S0217732399000249

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 $g_{A}^{0}\simeq 0$ leads to a negative $\eta'$-meson-quark coupling, which has been found to be compatible with the chiral quark model phenomenology.

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