F. Abe et al., STUDY OF 4-JET EVENTS AND EVIDENCE FOR DOUBLE PARTON INTERACTIONS IN P(P)OVER-BAR COLLISIONS AT ROOT-S = 1.8 TEV, Physical review. D. Particles and fields, 47(11), 1993, pp. 4857-4871
Kinematic properties of four-jet events produced in ppBAR collisions a
t square-root s = 1.8 TeV have been studied using data with an integra
ted luminosity of 325 nb-1 collected using the Collider Detector at Fe
rmilab 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 glu
on bremsstrahlung process and good agreement is observed. In addition,
a search for double parton scattering has been undertaken using varia
bles sensitive to the topology of four-jet events. A small double part
on content provides the best description of the data. We find N(DP)/N(
DB) = 5.4(-2.0)1.6%, where N represents the number of events attribute
d to each process. We measure sigma(DP) = 63(-28)+32 nb for jets havin
g p(T) > 25 GeV/c in the pseudorapidity interval \eta\ < 3.5.