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Multiplicity difference between heavy- and light-quark jets revisited

  • Theoretical Physics
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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.

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Authors and Affiliations

  1. LPTHE, University Paris-VI, 4 place Jussieu, 75252, Paris, France

    Yu L. Dokshitzer

  2. PNPI, 188300, Gatchina, St. Petersburg, Russia

    Yu L. Dokshitzer & V. A. Khoze

  3. INFN e Dipartimento di Fisica dell'Università di Bologna, v.le Berti Pichat 6/2, 40127, Bologna, Italy

    F. Fabbri

  4. Department of Physics and Institute for Particle Physics Phenomenology, University of Durham, DH1 3LE, Durham, UK

    V. A. Khoze

  5. Max-Planck-Institut für Physik (Werner-Heisenberg-Institut), Föhringer Ring 6, 80805, München, Germany

    W. Ochs

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  1. Yu L. Dokshitzer
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  2. F. Fabbri
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  3. V. A. Khoze
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  4. W. Ochs
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Correspondence to F. Fabbri.

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Arrival of the final proofs: 22 November 2005

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Dokshitzer, Y.L., Fabbri, F., Khoze, V.A. et al. Multiplicity difference between heavy- and light-quark jets revisited. Eur. Phys. J. C 45, 387–400 (2006). https://doi.org/10.1140/epjc/s2005-02424-5

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