Ratios of Multijet Cross Sections inpp¯Collisions at√s=1.8TeV

We report on a study of the ratio of inclusive three-jet to inclusive two-jet production cross sections as a function of total transverse energy in $p\overline{p}$ collisions at a center-of-mass energy $\sqrt{s}=1.8\mathrm{}$ TeV, using data collected with the D0 detector during the 1992–1993 run of the Fermilab Tevatron Collider. The measurements are used to deduce preferred renormalization scales in perturbative $O\left({\alpha }_s^3\right)$ QCD calculations in modeling soft-jet emission.