Seminarium Teorii Oddziaływań Elementarnych

Parameterizations of the pp scattering data at the LHC collision energies indicate a hollow in the inelasticity profile of the pp interaction, with less absorption for head-on collisions than at a non-zero impact parameter. We argue that hollowness in the impact parameter is a quantum effect: it precludes models of inelastic collisions where inelasticity is obtained by naive folding of partonic densities.