The nucleon's octet axial-charge gA(8) with chiral corrections
Date
2010
Authors
Bass, S.
Thomas, A.
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Journal article
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Physics Letters B: Nuclear Physics and Particle Physics, 2010; 684(4-5):216-220
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Steven D. Bass and Anthony W. Thomas
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Abstract
The value of the nucleon's flavour-singlet axial-charge extracted from polarised deep inelastic scattering is sensitive to the value of the octet axial-charge g<inf>A</inf><sup>(8)</sup> which is usually taken from an analysis of hyperon β-decays within the framework of SU(3) symmetry, namely 0.58 ± 0.03. Using the Cloudy Bag model we find that the value of g<inf>A</inf><sup>(8)</sup> is reduced by as much as 20% below the usual phenomenological value. This increases the value of the flavour-singlet axial-charge (g<inf>A</inf><sup>(0)</sup> |<inf>inv</inf>) derived from deep inelastic data and significantly reduces the difference between it and g<inf>A</inf><sup>(8)</sup>. © 2010 Elsevier B.V. All rights reserved.
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Copyright © 2010 Elsevier B.V. All rights reserved.