2009
DOI: 10.48550/arxiv.0912.1765
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The nucleon's octet axial-charge g_A^8 with chiral corrections

Steven D. Bass,
Anthony W. Thomas

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 (8)A 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 (8)A is reduced by as much as 20% below the usual phenomenological value. This increases the value of the flavour singlet axial charge (g (0)A | inv ) derived from deep inela… Show more

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Cited by 10 publications
(20 citation statements)
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“…4. The non-singlet charge a 8 = 0.53 +0.06 −0.06 lies between the value extracted from the hyperon β-decays under the assumption of SU(3) symmetry, 0.58±0.03, and the value 0.46 ± 0.05 obtained in the cloudy bag model [31]. Because the experimental value of a 0 extracted from DIS data depends on this quantity, further work to pin down the extent of SU(3) breaking would be valuable.…”
Section: As Indicated In Tablementioning
confidence: 52%
See 1 more Smart Citation
“…4. The non-singlet charge a 8 = 0.53 +0.06 −0.06 lies between the value extracted from the hyperon β-decays under the assumption of SU(3) symmetry, 0.58±0.03, and the value 0.46 ± 0.05 obtained in the cloudy bag model [31]. Because the experimental value of a 0 extracted from DIS data depends on this quantity, further work to pin down the extent of SU(3) breaking would be valuable.…”
Section: As Indicated In Tablementioning
confidence: 52%
“…However, the uncertainty of a 8 could be as large as 20% [29,30]. A recent re-evaluation of the nucleon's axial-charges in the Cloudy Bag model, taking into account the effect of the one-gluon-exchange hyperfine interaction and the meson cloud, led to the value a 8 = 0.46 ± 0.05 [31]. In this case, ∆s was found to be of order 0.01 in magnitude (and negative), with the small value of a 8 a consequence of SU(3) breaking.…”
mentioning
confidence: 99%
“…Theoretical predictions for nucleon electromagnetic form factors, and for example, parton distribution functions, have been made using a variety of approaches, such as quark models [15][16][17][18][19][20][21][22][23][24][25][26], QCD sum rules [27], the Dyson-Schwinger equations [28][29][30] and lattice QCD simulations [31][32][33][34][35][36][37][38][39]. For the other elements of the octet, prior to lattice QCD computations, early work on the spectrum, electromagnetic form factors and weak form factors was based on, for example, the bag model [40][41][42][43][44][45][46][47][48][49][50][51], QCD sum rules [27], constituent quark models [52][53][54] and more recently the Dyson-Schwinger equations [55].…”
Section: Introductionmentioning
confidence: 99%
“…A of the nucleon [17]. Instead it appears that the resolution of the spin crisis lies in the exchange of quark spin for orbital angular momentum of the quarks (and anti-quarks) [18][19][20].…”
Section: Introductionmentioning
confidence: 99%