Gauge symmetry and the EMC spin effect

Abstract

We emphasise the EMC spin effect as a problem of symmetry and discuss the renormalisation of the $C=+1$ axial tensor operators. This involves the generalisation of the Adler-Bell-Jackiw anomaly to each of these operators. We find that the contribution of the axial anomaly to the spin dependent structure function $g_1(x,Q^2)$ scales at $O({\alpha }_s)$. This means that the anomaly can be a large $x$ effect in $g_1$. Finally we discuss the jet signature of the anomaly.

Comments: 17 pages, Latex, Cavendish preprint HEP 93/2