Can the axial-vector coupling constant gAconstrain the quark confinement?
- 1 November 1986
- journal article
- letter
- Published by IOP Publishing in Journal of Physics G: Nuclear Physics
- Vol. 12 (11) , L243-L249
- https://doi.org/10.1088/0305-4616/12/11/001
Abstract
The authors show that gA/gV receives contributions only from fields contributing to the helicity of the nucleon. This implies smallness of centre-of-mass/recoil corrections to gA/gV as well as a strong surface dependence of gA/gV. This helicity argument sheds new light on the modelling of the hadrons in terms of (hybrid) Skyrmions. It is demonstrated for chiral soliton models that rather drastic changes of the scalar sigma field are unavoidable if one wants gA to be correctly predicted at the mean field level. While these changes affect the sigma field in the surface region they do not spoil low energy properties of the nucleon.Keywords
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