Energy dependence of ratios of multiplicities and their slopes for gluon and quark jets

Details Energy dependence of ratios of multiplicities and their slopes for gluon and quark jets Energy dependence of ratios of multiplicities and their slopes for gluon and quark jets

1998-08-31

arxiv.org/abs/hep-ph/9808481v1

JETP Lett. 68 (1998) 559-562

Physics

High Energy Physics

High Energy Physics - Phenomenology

5 pages, LATEX, no Figs; submitted to JETP Lett

Scientific paper

10.1134/1.567906

The difference between the ratio of multiplicities and the ratio of their derivatives on energy for gluon and quark jets is calculated up to next-to-next-to leading order of perturbative QCD. Its non-zero value is uniquely defined by the running property of the QCD coupling constant. It is shown that this difference is rather small compared to values which can be obtained from experimental data. This disagreement can be ascribed either to strong non-perturbative terms or to experimental problems with a scale choice, jets separation and inadequate assignement of soft particles to jets.

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