Discriminating Between Chiral Models Of The Nucleon Via Hard Semi-Inclusive (E)Over-Right-Arrow(N)Over-Right-Arrow And (N)Over-Right-Arrow(N)Over-Right-Arrow Scattering

Measurements of the flavor asymmetry of the polarized antiquark distributions in the nucleon, Delta (u) over bar(x) - Delta (d) over bar(x), would provide a unique opportunity to discriminate between different models of the role of the chiral structure of the nucleon in deep-inelastic scattering. In the pion cloud model of the nucleon's sea quark distributions the polarized flavor asymmetry is zero, while the large-N-C picture of the nucleon as a chiral soliton predicts large polarized flavor asymmetries. We discuss the prospects for measuring the polarized antiquark flavor asymmetries in two types of semi-inclusive scattering experiments: i) Hadron production in semi-inclusive polarized eN scattering (SMC, HERMES); ii) Drell-Yan lepton pair production in polarized NN scattering at HERA or RHIC energies. In particular, the Drell-Yan spin asymmetries are shown to be remarkably sensitive to be remarkably sensitive to Delta (u) over bar(x) - Delta (d) over bar(x).