A polarised QCD condensate : νp elastic scattering as a probe of U A ( 1 ) dynamics

A polarised QCD condensate: νp elastic scattering as a probe of U A (1) dynamics Abstract 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 g 1 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.