Properties of six-jet events with large six-jet mass at the Fermilab proton-antiproton collider

We describe the properties of six-jet events, with the six-jet mass exceeding 520GeV/c{sup 2}, produced at the Fermilab proton-antiproton collider operating at a center-of-mass energy of 1.8 TeV. Observed distributions for a set of 20 multijet variables are compared with predictions from the HERWIG QCD parton shower Monte Carlo program, the NJETS leading order QCD matrix element Monte Carlo program, and a phase-space model in which six-jet events are distributed uniformly over the kinematically allowed region of the six-body phase space. In general the QCD predictions provide a good description of the observed six-jet distributions. {copyright} {ital 1997} {ital The American Physical Society}