Spin Content of Lambda in QCD Sum Rules

Details Spin Content of Lambda in QCD Sum Rules Spin Content of Lambda in QCD Sum Rules

2009-06-24

arxiv.org/abs/0906.4523v1

Phys.Rev.D79:114028,2009

Physics

High Energy Physics

High Energy Physics - Phenomenology

6 pages, 2 figures

Scientific paper

10.1103/PhysRevD.79.114028

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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