Study of four-jet events and evidence for double parton interactions in pp̄ collisions at s=1.8 TeV

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 p T 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