Rapidity Gaps in Jet Events at DØ Rapidity Gaps in Jet Events at D

Abstract Preliminary results from the D experiment on jet production with rapidity gaps in pp collisions are presented. A class of dijet events with a forward rapidity gap is observed at center-of-mass energies p s = 1800GeV and 630 GeV. The numb e r o f e v ents with rapidity gaps at both center-of-mass energies is signi cantly greater than the expectation from multiplicity uctuations and is consistent with a hard di ractive process. A class of events with two forward gaps and central dijets is also observed at 1800GeV. This topology is consistent with hard double pomeron exchange