Further Properties of High-Mass Multijet Events at the Fermilab Proton-Antiproton Collider

Abstract

The properties of high-mass multijet events produced at the Fermilab proton-antiproton collider are compared with leading order QCD matrix element predictions, QCD parton shower Monte Carlo predictions, and the predictions from a model in which events are distributed uniformly over the available multibody phase-space. Multijet distributions corresponding to (4N-4) variables that span the N-body parameter space are found to be well described by the QCD calculations for inclusive three-jet, four-jet, and five-jet events. The agreement between data, QCD Matrix Element calculations, and QCD parton shower Monte Carlo predictions suggests that 2 -> 2 scattering plus gluon radiation provides a good first approximation to the full LO QCD matrix element for events with three, four, or even five jets in the final state.

49 pages with 19 figures. Submitted to Phys. Rev. D. PostScript with full resolution figures also available at http://www-cdf.fnal.gov/physics/pub96/cdf3480_multijet_prd_draft3.ps

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• Global QCD Analysis and the CTEQ Parton Distributions
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• Measurement of Three-jet Distributions in Photoproduction at HERA
• Standard Model backgrounds to supersymmetry searches
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• Comparison of Three-jet Events in Proton-Antiproton Collisions at Center-of-mass Energy 1.8 TeV to Predictions from a Next-to-leading Order QCD Calculation
• Comparison of Three-jet Events in Proton-Antiproton Collisions at sqrt{s}=1.8 TeV to Predictions from a Next-to-leading Order QCD Calculation