A peculiar prediction of perturbative QCD, obtained within the Local Parton Hadron Duality (LPHD) framework, is that the multiplicity difference δQℓ between heavy and light quark jets produced in e+e− annihilation is energy independent. In the Modified Leading Logarithmic Approximation (MLLA) the corresponding constant is derived in terms of a few experimentally measurable quantities. While the energy independence of δQℓ has been succesfully verified experimentally for b‐quarks up to the highest LEP2 energy, its numerical prediction overestimates the experimental results. The work presented in this talk, done in collaboration with Yuri L. Dokshitzer, Valery A. Khoze and Wolfgang Ochs, shows that in the light of new experimental results and the improvement in the understanding of the experimental data, this prediction needs indeed a revision. We now find δbℓ = 4.4 ± 0.4, in better agreement with experiment, and we shaw that the remaining difference can be attributed largely to next‐to‐MLLA contributions, an important subset of which are identified and evaluated. The situation with charmed quarks is also reviewed.
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11 April 2006
MULTIPARTICLE DYNAMICS: XXXV International Symposium on Multiparticle Dynamics; and Workshop on Particle Correlations and Femtoscopy
9-17 August 2005
Kromeriz (Czech Republic)
Research Article|
April 11 2006
Multiplicity Difference between Heavy and Light Quark Jets Revisited
Fabrizio Fabbri
Fabrizio Fabbri
INFN e Dipartimento di Fisica dell’ Università, viale Berti Pichat 6/2, 40127 Bologna, Italy
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AIP Conf. Proc. 828, 42–48 (2006)
Citation
Fabrizio Fabbri; Multiplicity Difference between Heavy and Light Quark Jets Revisited. AIP Conf. Proc. 11 April 2006; 828 (1): 42–48. https://doi.org/10.1063/1.2197393
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