The final state hadrons in polarised deep inelastic scattering

Abstract

General arguments suggest that the non-perturbative background field in QCD may have a non-trivial spin structure. We discuss how this effect may be manifest in semi-inclusive measurements of fast pions in polarised deep inelastic scattering.

Comments: Completely revised. To appear in Physics Letters B. 9 pages, 1 figure (appended at the end)