Analytical asymptotics for hard diffraction

We show that the cross section for diffractive dissociation of a small onium off a large nucleus at total rapidity Y and requiring a minimum rapidity gap Ygap can be identified, in a well-defined parametric limit, with a simple classical observable on the stochastic process representing the evolution of the state of the onium, as its rapidity increases, in the form of color dipole branchings: it formally coincides with twice the probability that an even number of these dipoles effectively participate in the scattering, when viewed in a frame in which the onium is evolved to the rapidity Y − Ygap. Consequently, finding asymptotic solutions to the Kovchegov-Levin equation, which rules the Y dependence of the diffractive cross section, boils down to solving a probabilistic problem. Such a formulation authorizes the derivation of a parameter-free analytical expression for the gap distribution. Interestingly enough, events in which many dipoles interact simultaneously play an important role, since the distribution of the number k of dipoles participating in the interaction turns out to be proportional to 1/[k(k − 1)].