Abstract
We perform the isospin decomposition of proton and neutron SLAC data for moderately low in the region . The isovector part is well described by a power behavior , where does not correspond to the intercept of a single Regge trajectory, as expected. However, the observed power leads to the validity of the Bjorken sum rule and it is consistent with the power extracted from all previous data using next-to-leading order evolution. At the same time, the isoscalar behavior may be interpreted as a partial cancellation between a positive nonsinglet contribution and a strongly negative singlet one. Further experimental consequences are mentioned.
- Received 27 August 1996
DOI:https://doi.org/10.1103/PhysRevD.56.1549
©1997 American Physical Society