Kinematic properties of four-jet events produced in ppBAR collisions at square-root 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. We find N(DP)/N(DB) = 5.4(-2.0)1.6%, where N represents the number of events attributed to each process. We measure sigma(DP) = 63(-28)+32 nb for jets having p(T) > 25 GeV/c in the pseudorapidity interval \eta\ < 3.5. RI St.Denis, Richard/C-8997-2012; Chiarelli, Giorgio/E-8953-2012; Azzi, Patrizia/H-5404-2012
STUDY OF 4-JET EVENTS AND EVIDENCE FOR DOUBLE PARTON INTERACTIONS IN P(P)OVER-BAR COLLISIONS AT ROOT-S = 1.8 TEV
PIACENTINO, Giovanni Maria;
1993-01-01
Abstract
Kinematic properties of four-jet events produced in ppBAR collisions at square-root 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. We find N(DP)/N(DB) = 5.4(-2.0)1.6%, where N represents the number of events attributed to each process. We measure sigma(DP) = 63(-28)+32 nb for jets having p(T) > 25 GeV/c in the pseudorapidity interval \eta\ < 3.5. RI St.Denis, Richard/C-8997-2012; Chiarelli, Giorgio/E-8953-2012; Azzi, Patrizia/H-5404-2012I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
