Abstract
The growth and development of particle jets produced in proton-antiproton collisions at 1.8 TeV are studied over a momentum range from 0.5 GeV/c to 50 GeV/c. A variety of leading (highest momentum) charged observables are compared with the QCD Monte Carlo models HERWIG, ISAJET, and PYTHIA. The models describe fairly well the multiplicity distribution of charged particles within the leading charged the size of the leading charged the radial distribution of charged particles and momentum around the leading charged direction, and the momentum distribution of charged particles within the leading charged jet. The direction of the leading particle jet in each is used to define three regions of eta-phi space. The toward region contains the leading particle jet, while the away region, on the average, contains the away-side jet. The transverse region is perpendicular to the plane of the hard 2-to-2 scattering and is very sensitive to the underlying event component of the QCD Monte Carlo models. HERWIG, ISAJET, and PYTHIA with their default parameters do not describe correctly all the properties of the transverse region.
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