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The perturbative QCD approach to multiparticle production predicts acharacteristic suppression of particle multiplicity in a heavy quark jet ascompared to a light quark jet. In the Modified Leading LogarithmicApproximation (MLLA) the multiplicity difference \delta_{Q\ell} between heavyand light quark jets is derived in terms of a few other experimentally measuredquantities. The earlier prediction for b-quarks needs revision in the light ofnew experimental results and the improvement in the understanding of theexperimental data. We now find \delta_{b\ell}=4.4\pm0.4. The updated MLLAresults on \delta_{b\ell} and \delta_{c\ell} are compared with the present datafrom e^+e^- annihilation. Their expected energy independence is confirmedwithin the energy range between 29 and 200 GeV; the absolute values are now inbetter agreement with experiment than in the previous analysis, and theremaining difference can be attributed largely to next-to-MLLA contributions,an important subset of which are identified and evaluated.Comment: 33 pages, 2 figures, version to appear in Eur.Phys.J.

Multiplicity difference between heavy- and light-quark jets revisited