DOI 10.1007/s100529900095
Simplification of higher-twist evolution in the large Nc limit: why and why not
X. Ji - J. Osborne
Department of Physicsm University of Maryland, College Park, Maryland, MD 20742, USA
Received: 24 February 1999 / Published online: 18 June 1999
Abstract
Working in the light-cone gauge, we find a simple
procedure to calculate the autonomous one-loop
Q2 evolution of the twist-three part of
the nucleon gT(x, Q2) structure function
in the large-Nc limit. Our
approach allows us to investigate the
possibility of a similar large-Nc
simplification for other higher-twist
evolutions. In particular,
we show that it does not occur
for the twist-four part of the
f4(x, Q2), g3(x, Q2) and h3(x, Q2) distributions.
We also argue that the simplification of the
twist-three evolution
does not persist beyond one loop.
Copyright Springer-Verlag
