Charged Jet Evolution and the Underlying Event in Proton-Antiproton Collisions at 1.8 TeV
The CDF Collaboration
October 1, 2000 |
Abstract
The growth and development of charged particle jets produced in proton-antiproton collisions
at 1.8 TeV are studied. A variety of leading (highest transverse momentum) charged jet
observables are compared with the QCD "hard scattering" Monte-Carlo models of HERWIG,
ISAJET, and PYTHIA. The models describe fairly well the multiplicity distribution of charged
particles within the leading charged jet, the size of the leading charged jet, the radial flow of
charged particles and transverse momentum around the leading charged jet direction, and the
momentum distribution of charged particles within the leading charged 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 behavior 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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Analysis WEBsite.
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Earlier version (Draft 1) postscript file (PS).
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"The Underlying Event: DiJet vs. Z-jet", CDF Note 5295.
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Earlier version (Draft 2) postscript file (PS).
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version (Draft 3) postscript file (PS).
Released to the CDF collaboration on October 12, 2000.
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