Abstract
The growth and development of "charged particle jets" produced in proton-antiproton
collisions at 1.8 TeV are studied. A variety of "local" leading jet observables are
compared with the QCD "hard scattering" Monte-Carlo models of Herwig, Isajet, and Pythia.
The models describe quite well (although not completely) the multiplicity distribution of
charged particles within the leading jet, the "size" of the leading jet, the radial flow of
charged particles and transverse momentum around the leading jet direction, and the momentum
distribution of charged particles within the leading jet. Also, a number of "global"
observables are examined, where to fit the observable the QCD Monte-Carlo models have to
describe correctly the entire proton-antiproton event structure. In particular, we study
carefully the growth and structure of the "underlying event" in hard scattering processes.
None of the models (with their default parameters) describe correctly all the properties of
the underlying event.
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