A polarised QCD condensate: nu p elastic scattering as a probe of U_A(1) dynamics

Details A polarised QCD condensate: nu p elastic scattering as a probe of U_A(1) dynamics A polarised QCD condensate: nu p elastic scattering as a probe of U_A(1) dynamics

1997-12-23

arxiv.org/abs/hep-ph/9712507v2

Mod.Phys.Lett. A13 (1998) 791-804

Physics

High Energy Physics

High Energy Physics - Phenomenology

13 pages LaTeX, Section 3 improved to include discussion of the 3 flavour quark instanton interaction; to appear in Mod. Phys.

Scientific paper

10.1142/S0217732398000851

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 nu p elastic scattering experiments.

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