TL;DR
This paper uses QCD sum rules to calculate the spin contributions of quarks in the Lambda hyperon, confirming small SU(3) breaking effects and negative polarization of u and d quarks.
Contribution
It provides a detailed QCD sum rule calculation of Lambda's axial-vector couplings, clarifying quark spin contributions and SU(3) symmetry effects.
Findings
Light-quark contributions agree with experimental data.
Flavor-SU(3)-breaking effects are minimal.
u and d quarks are negatively polarized in Lambda.
Abstract
We calculate the isoscalar axial-vector coupling constants of the Lambda hyperon using the method of QCD sum rules. A determination of these coupling constants reveals the individual contributions of the u, d and the s quarks to the spin content of Lambda. Our results for the light-quark contributions are in agreement with those from experiment assuming flavor SU(3). We also find that the flavor-SU(3)-breaking effects are small and the contributions from the u and the d quarks to the Lambda polarization are negatively polarized as in the flavor-SU(3) limit.
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