Abstract
The isoscalar axial-vector renormalization constant is reevaluated using the QCD sum-rule method. It is found to be substantially different from the anomaly-free octet axial-vector u¯d¯-2s¯ coupling. Combining this determination with the known values of the isovector coupling and the F/D ratio for the octet current, we find the integral of the polarized proton structure function to be =F(x)dx=0.135, in agreement with recent measurement by the European Muon Collaboration.
- Received 6 October 1988
DOI:https://doi.org/10.1103/PhysRevD.39.2547
©1989 American Physical Society