Diffractive electron-nucleus scattering and ancestry in branching random walks

Abstract

We point out an analogy between diffractive electron-nucleus scattering events, and realizations of one-dimensional branching random walks selected according to the height of the genealogical tree of the particles near their boundaries. This correspondence is made transparent in an event-by-event picture of diffraction emphasizing the statistical properties of gluon evolution, from which new quantitative predictions straightforwardly follow: we are able to determine the distribution of the total invariant mass produced diffractively, which is an interesting observable that can potentially be measured at a future electron-ion collider.

5 pages, 3 figures. v2: small additions, in particular a paragraph to discuss the link to DIS phenomenology; version to be published in Phys.Rev.Lett