Recoil order chiral corrections to baryon octet axial vector currents - art. no. 034002

We calculate chiral corrections to the octet axial vector currents through O(p(3)) using baryon chiral perturbation theory (BCPT). The relativistic BC PT framework allows one to sum an infinite series of recoil corrections at a given order in the chiral expansion. We also include SU(3)-breaking opera tors occurring at O(p(2)) not previously considered. We determine the corre sponding low-energy constants (LEC's) from hyperon semileptonic decay data using a variety of infrared regularization schemes. When decuplet states ar e integrated out. the chiral expansion of the axial vector currents does no t display the proper convergence behavior, regardless of which scheme is ch osen. We also observe that recoil corrections are dominated by the leading 1/m(N) contributions. We explore the implications of our analysis for deter minations of the strange quark contribution to the nucleon spin, Delta (s).