Axial Vector Current and Coupling of the Quark in the Instanton Model

Details Axial Vector Current and Coupling of the Quark in the Instanton Model Axial Vector Current and Coupling of the Quark in the Instanton Model

2002-08-27

arxiv.org/abs/hep-ph/0208250v3

Phys.Rev. D67 (2003) 014008

Physics

High Energy Physics

High Energy Physics - Phenomenology

8 pages Revtex4, 3 PostScript figures, sign error corrected (results unchanged)

Scientific paper

10.1103/PhysRevD.67.014008

We compute the axial vector current, form factor, and coupling for quarks in the instanton liquid model with two light flavors. Non-local current corrections are derived, as required by the effective 't Hooft interaction. We obtain a pion-mediated axial form factor and an axial coupling which, when simply applied in the non-relativistic limit for constituent quarks, matches the experimental value to within a few percent, both in and out of the chiral limit.

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