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We propose a partonic picture for high-mass diffractive dissociation eventsin onium-nucleus scattering, which leads to simple and robust predictions forthe distribution of the sizes of gaps in diffractive dissociation of virtualphotons off nuclei at very high energies. We show that the obtained probabilitydistribution can formally be identified to the distribution of the decay timeof the most recent common ancestor of a set of objects generated near the edgeof a branching random walk, and explain the physical origin of this appealingcorrespondence. We then use the fact that the diffractive cross sectionconditioned to a minimum rapidity gap size obeys a set of Balitsky-Kovchegovequations in order to test numerically our analytical predictions. Furthermore,we show how simulations in the framework of a Monte Carlo implementation of theQCD evolution support our picture.

Rapidity gap distribution in diffractive deep-inelastic scattering and parton genealogy