B. Andersson, G. Gustafson, J. Häkkinen, M. Ringnér and P. Sutton
Is there screwiness at the end of the QCD cascades?
Journal of High Energy Physics 9809, 014 (1998)

Abstract:
We discuss what happens at the end of the QCD cascades. We show that, with just a few reasonable assumptions, the emission of soft gluons is constrained to produce an ordered field in the form of a helix. We describe how to modify the Lund fragmentation scheme in order to fragment such a field. Our modified fragmentation scheme yields results which are consistent with current experimental measurements, but predicts at least one signature which should be observable.

LU TP 98-14