Abstract
We have measured the spin-dependent structure function in inclusive deep-inelastic scattering of polarized muons off polarized protons, in the kinematic range and A next-to-leading order QCD analysis is used to evolve the measured to a fixed The first moment of at is (stat) (syst) (evol). This result is below the prediction of the Ellis-Jaffe sum rule by more than two standard deviations. The singlet axial charge is found to be In the Adler-Bardeen factorization scheme, is required to bring ΔΣ in agreement with the quark-parton model. A combined analysis of all available proton, deuteron, and data confirms the Bjorken sum rule.
- Received 11 February 1997
DOI:https://doi.org/10.1103/PhysRevD.56.5330
©1997 American Physical Society