Pomerons and jet events at HERA

We study two and three jet events with a large rapidity gap at HERA. As a minimal model we take a scalar Pomeron (ℙ) with a pointlike coupling to quarks and gluons. The only degrees of freedom are the coupling constants of the Pomeron to the quarks, g ℙqq , and the gluons, g ℙgg .1