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{\bf EPS-HEP99} \\
{\bf Abstract \# 000} \\
{\bf Parallel sessions: 1,3} \\
{\bf Plenary sessions:  1,3}
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\abstractheader{ {\bf  
Rapidity gaps between jets in photoproduction at HERA } \\ \\
H1 Collaboration, \\
DESY, Notkestr.85, D-22607 Hamburg, Germany
}

\abstractbody{
Photoproduction events which have two or more jets have been studied
in the $\gamma p$ centre-of-mass energy range $170$ GeV $ <  W <  243$ GeV
with the H1 detector at HERA. The fraction $f(\Delta \eta)$ of events with a
rapidity gap between the two highest $E_T$ jets is measured for $\Delta \eta >
3.5$ between the jet axes. An excess of events with a rapidity gap, over what
would be expected from standard photoproduction processes, is observed. The
excess can be interpreted as the result of the exchange of a strongly
interacting colour singlet object.
}
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