Multiplicity Difference between Heavy and Light Quark Jets Revisited
Yuri L. Dokshitzer, Fabrizio Fabbri, Valery A. Khoze, Wolfgang Ochs
Abstract
The perturbative QCD approach to multiparticle production predicts a characteristic suppression of particle multiplicity in a heavy quark jet as compared to a light quark jet. In the Modified Leading Logarithmic Approximation (MLLA) the multiplicity difference δQ between heavy and light quark jets is derived in terms of a few other experimentally measured quantities. The earlier prediction for b-quarks needs revision in the light of new experimental results and the improvement in the understanding of the experimental data. We now find δb=4.40.4. The updated MLLA results on δb and δc are compared with the present data from e+e- annihilation. Their expected energy independence is confirmed within the energy range between 29 and 200 GeV; the absolute values are now in better agreement with experiment than in the previous analysis, and the remaining difference can be attributed largely to next-to-MLLA contributions, an important subset of which are identified and evaluated.
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