Related paper Coherent photoproduction of $ρ^{0}$ vector mesons in ultra-peripheral Pb-Pb collisions at $\sqrt{s_{\rm NN}} = 5.02$ TeV . Invariant mass (left) and transverse momentum (right) distributions for opposite-sign (blue) and like-sign (red) pairs [png] [pdf] [eps][png] [pdf] [eps]
