Erkol, GürayOka, M.2010-08-162010-08-162009-06-01http://hdl.handle.net/10679/73https://doi.org/10.1103/PhysRevD.79.114028We calculate the isoscalar axial-vector coupling constants of the Λ 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 Λ. 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 Λ polarization are negatively polarized as in the flavor-SU(3) limit.engopenAccessarticle7911114028-1114028-600026770130005810.1103/PhysRevD.79.1140282-s2.0-67649862061