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

The properties of two-, three-, four-, five-, and six-jet events with multijet masses $>600\mathrm{}$ GeV ${/c}^2$ are compared with QCD predictions. The shapes of the multijet-mass and leading-jet-angular distributions are approximately independent of jet multiplicity and are well described by the NJETS matrix element calculation and the HERWIG parton shower Monte Carlo predictions. The observed jet transverse momentum distributions for three- and four-jet events discriminate between the matrix element and parton shower predictions, the data favoring the matrix element calculation.