Study of four-jet events and evidence for double parton interactions in pp-bar collisions at sqrt s =1.8 TeV.
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Kinematic properties of four-jet events produced in pp collisions at s=1.8 TeV have been studied using data with an integrated luminosity of 325 nb-1 collected using the Collider Detector at Fermilab during the 1988-1989 Fermilab Collider run. The individual jet pT spectra and the angles between each jet pair are compared to the predictions of leading-order quantum chromodynamics for the double gluon bremsstrahlung process and good agreement is observed. In addition, a search for double parton scattering has been undertaken using variables sensitive to the topology of four-jet events. A small double parton content provides the best description of the data. We find NDPNDB=5.4-2.0+1.6%, where N represents the number of events attributed to each process. We measure DP=63-28+32 nb for jets having pT>25 GeV/c in the pseudorapidity interval ||<3.5. 1993 The American Physical Society.