After reviewing the color fluctuation model of hadron-nucleus interactions we consider the example of pA collisions with production of dijets in the proton fragmentation region as a function of transverse energy in rapidity range not affected by the jet fragmentation. A gross disagreement with the expectations of Glauber type models of dijet production was reported by the LHC and RHIC experiments for
Next we consider the effects of color fluctuations in the photon in photon-nucleus collisions. We predict the distribution of the cross section over the strength of interaction and over the number of wounded nucleons in the perturbative and nonperturbative domains and find a smooth matching between the two regimes.
We introduce a new tool for the analysis of ultraperipheral photon-nucleus collisions (UPC) and pA collisions sensitive to small-x dynamics: measurement of the multiplicity of forward neutrons produced in the de-excitation of the nucleus, which is correlated with the number of wounded nucleons. Several examples of the method are given: testing the dynamics of nuclear shadowing down to