Eur. Phys. J. C 19, 493-501
DOI: 10.1007/s100520100614

Multiplicities in parton and dipole QCD cascades

P. Edén

NORDITA, Blegdamsvej 17, 2100 Copenhagen, Denmark

eden@nordita.dk

(Received: 19 October 2000 / Revised version: 26 January 2001 / Published online: 15 March 2001 -© Springer-Verlag 2001)

Abstract
Evolution equations for multiplicities in QCD cascades can, both in the parton and dipole picture, be used to estimate corrections beyond the formal accuracy of the modified leading log approximation (MLLA). The differences between the two pictures, and other uncertainties beyond first order MLLA corrections, are here investigated in some detail. For example, I discuss how some colour suppressed corrections, which cannot be determined without better knowledge of non-perturbative QCD, are related to the question of colour reconnection. A generalized evolution equation for the dipole cascade is also presented.

© Società Italiana di Fisica, Springer-Verlag 2001