Measurement of the ratio of three-jet to two-jet cross sections in $p\bar{p}$ collisions at $\sqrt{s}=1.96$ TeV
Phys.Lett. B720 (2013) 6-12

Abstract (data abstract)
Fermilab-Tevatron. Measurement of the ratios of multijet (3/2) cross sections produced in proton-antiproton interactions at a centre of mass energy of 1.96 TeV. The data sample used has an integrated luminosity of 0.7 fb-1 with the results being presented as a function of different maximum and minumum jet transverse momentum requirements.