THE UNDERLYING EVENT IN LARGE TRANSVERSE MOMENTUM CHARGED JET AND
Z-BOSON PRODUCTION
Rick Field
(for the CDF Collaboration)
Contribution to DPF2000
August 12, 2000
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Abstract
We study the behavior of the "underlying event" in large transverse momentum
charged jet and Z-boson production at 1.8 TeV and compare with the QCD Monte-Carlo models.
The data indicate that neither ISAJET or HERWIG produce
enough charged particles (with PT > 0.5 GeV/c) from the "beam-beam remnant" component and that
ISAJET produces too many charged particles from initial-state radiation. PYTHIA which uses multiple parton
scattering to enhance the underlying event does the best job describing the data.
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Zipped Postscript (PS) file (18 pages).
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