Measurements of the structure of quark and gluon jets in hadronic Z decays |
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Authors: | R Barate |
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Institution: | (1) Laboratoire de Physique des Particules (LAPP), IN2P3-CNRS, 74019 Annecy-le-Vieux Cedex, France, FR |
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Abstract: | An experimental investigation of the structure of identified quark and gluon jets is presented. Observables related to both
the global and internal structure of jets are measured; this allows for tests of QCD over a wide range of transverse momentum
scales. The observables include distributions of jet-shape variables, the mean and standard deviation of the subjet multiplicity
distribution and the fragmentation function for charged particles. The data are compared with predictions of perturbative
QCD as well as QCD-based Monte Carlo models. In certain kinematic regions the measurements are sensitive mainly to perturbatively
calculable effects, allowing for a test of QCD. The comparisons are also extended into regions where nonperturbative effects
become large, and in this way the transition from hard to soft QCD is investigated. It is found that by including leading
and next-to-leading logarithmic contributions in the QCD predictions, the agreement with the data can be extended to lower
transverse momentum scales, especially for gluon jets.
Received: 2 February 1998 / Published online: August 9, 2000 |
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