Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2005-08-05
Eur.Phys.J.C45:387-400,2006
Physics
High Energy Physics
High Energy Physics - Phenomenology
33 pages, 2 figures, version to appear in Eur.Phys.J.C
Scientific paper
10.1140/epjc/s2005-02424-5
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 \delta_{Q\ell} 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 \delta_{b\ell}=4.4\pm0.4. The updated MLLA results on \delta_{b\ell} and \delta_{c\ell} 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.
Dokshitzer Yuri L.
Fabbri Fabrizio
Khoze Valery A.
Ochs Wolfgang
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