Related paper Coherent $ρ^0$ photoproduction in ultra-peripheral Pb-Pb collisions at $\mathbf{\sqrt{\textit{s}_{\rm NN}}} = 2.76$ TeV Energy deposit in the Zero-Degree Calorimeters. The curves correspond to Gaussian fitsfor 0, 1, 2, 3, or 4 neutrons entering the calorimeter. The plot is for events satisfying therequirements (i)--(vi) described in the text [png] [pdf]
