Recoil order chiral corrections to baryon octet axial vector currents and large Nc QCD
We compute the chiral corrections to octet baryon axial vector currents through O(p3) in heavy baryon chiral perturbation theory, including both octet and decuplet baryon intermediate states. We include the latter in a consistent way by using the small scale expansion. We find that, in contrast to the situation at O(p2), there exist no cancellations between octet and decuplet contributions at O(p3). Consequently, the O(p3) corrections spoil the expected scaling behavior of the chiral expansion. We discuss this result in terms of the 1/Nc expansion. We also consider the implications for the determination of the strange quark contribution to the nucleon spin from polarized deep inelastic scattering data.
Additional Information© 2002 The American Physical Society Received 22 January 2002; published 20 August 2002 This work was supported in part under U.S. Department of Energy contract No. DE-FGO2-00ER41146, the National Science Foundation under award PHY00-71856, and by the National Science Foundation Young Investigator program. We thank E. Jenkins, B. R. Holstein, and J. L. Goity for useful discussions.
Published - ZHUprd02b.pdf