Multiplicity Difference between Heavy and Light Quark Jets Revisited
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 \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.
Cite
@article{arxiv.hep-ph/0508074,
title = {Multiplicity Difference between Heavy and Light Quark Jets Revisited},
author = {Yuri L. Dokshitzer and Fabrizio Fabbri and Valery A. Khoze and Wolfgang Ochs},
journal= {arXiv preprint arXiv:hep-ph/0508074},
year = {2009}
}
Comments
33 pages, 2 figures, version to appear in Eur.Phys.J.C