INSPIRE

280GeV with the ZEUS detector at HERA. A class of events is observed with little hadronic activity between the jets. The jets are separated by pseudorapidity intervals (

\Delta\eta

) of up to four units and have transverse energies greater than 6GeV. A gap is defined as the absence between the jets of particles with transverse energy greater than 300MeV. The fraction of events containing a gap is measured as a function of \deta. It decreases exponentially as expected for processes in which colour is exchanged between the jets, up to a value of

\Delta\eta \sim 3

, then reaches a constant value of about 0.1. The excess above the exponential fall-off can be interpreted as evidence for hard diffractive scattering via a strongly interacting colour singlet object.

Note:

19 pages, latex, 3 figures appended as uuencoded file Report-no: DESY 95-194

positron p: colliding beams
colliding beams: positron p
exchange: one-photon
one-photon: exchange
photon p: interaction
interaction: photon p
jet: photoproduction
photoproduction: jet
rapidity: gap
cross section: rapidity dependence

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Figures(4)

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