Physics – High Energy Physics – High Energy Physics - Experiment
Scientific paper
1995-10-26
Phys.Lett.B369:55-68,1996
Physics
High Energy Physics
High Energy Physics - Experiment
19 pages, latex, 3 figures appended as uuencoded file. Author list corrected
Scientific paper
10.1016/0370-2693(95)01588-4
Photoproduction events which have two or more jets have been studied in the $W_{\gamma p}$ range 135~GeV $< W_{\gamma p} <$ 280~GeV 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 6~GeV. A gap is defined as the absence between the jets of particles with transverse energy greater than 300~MeV. The fraction of events containing a gap is measured as a function of $\Delta\eta$. 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.
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