Perturbative QCD Description of Mean Jet and Particle Multiplicities in e+e- annihilation

Abstract

A complete numerical solution of the evolution equation for parton multiplicities in quark and gluon jets with initial conditions at threshold is presented. Data on both hadron and jet multiplicities in e+e- annihilation are well described with a common normalization, giving further support to the picture of Local Parton Hadron Duality. Predictions for LEP-II energies are presented. Furthermore we study the sensitivity to the cutoff parameter Q_0 and the scale of alpha_s.

Comments: LaTeX, 7 pages, 3 figures, uses espcrc2.sty, to appear in Proc. of XXVII International Symposium on Multiparticle Dynamics, Frascati, Italy, September 1997, Nucl Phys. B (Proc. Suppl.)