Figure 2

The cross section ratios ${\rm B.R.}_{\psi(\rm 2S)\rightarrow\mu^+\mu^-}\sigma^{\psi(\rm 2S)}/{\rm B.R.}_{{\rm J}/\psi\rightarrow\mu^+\mu^-}\sigma^{{\rm J}/\psi}$ for p-Pb and Pb-p collisions,compared with the corresponding pp results at $\sqrt{s}=7$ TeV. The horizontal bars correspond to the width of the rapidity regions under study The vertical error bars represent statistical uncertainties, the boxes correspond to systematic uncertainties.