A POLARISED QCD CONDENSATE: νp ELASTIC SCATTERING AS A PROBE OF U_A(1) DYNAMICS

U_A(1) dynamics have the potential to induce a polarised condensate inside a nucleon. The formation of this condensate is related to the realisation of U_A(1) symmetry breaking by tunneling processes such as instantons. If it is present, the polarised condensate induces a term in g₁ which has support only at x=0. Tunneling processes then induce a net transfer of "spin" from finite x to x=0. The polarised condensate may be measured by comparing the flavour-singlet axial charges which are extracted from polarised deep inelastic and νp elastic scattering experiments.