Figure 2

Measured differential cross section of $\psi(\rm{2S})$ photo-production in Pb--Pb ultra-peripheral collisions at $\snn$=2.76 TeV at $-0.9 < y< 0.9$ in three different channels. The square represents the systematic uncertainties while the bar represents the statistic uncertainty The combined cross section uncertainty (shaded area) was obtained using the prescription from reference [33].