Inclusive Psi(2S) production in p-Pb collisions with ALICE

Abstract

The ALICE Collaboration has studied the inclusive $\psi (2S)$ production in p-Pb collisions at $\sqrt{s_{\mathrm{NN}}}=5.02$ TeV at the CERN LHC. Measurements are performed, in the ${\mu }^{+}{\mu }^{-}$ decay channel, in a forward (2.03$<y_{\mathrm{cms}}<$3.53) and in a backward (-4.46$<y_{\mathrm{cms}}<$-2.96) centre of mass rapidity ranges, as a function of transverse momentum or event activity. The $\psi (2S)$ production is compared to the $J/\psi$ one through the double ratio $[{\sigma }_{\psi (2S)}/{\sigma }_{J/\psi }{]}_{\mathrm{pPb}}/[{\sigma }_{\psi (2S)}/{\sigma }_{J/\psi }{]}_{\mathrm{pp}}$ between the cross sections evaluated in p-Pb and pp collisions and by calculating the $J/\psi$ and $\psi (2S)$ nuclear modification factors. Results indicate that the $\psi (2S)$ production is suppressed with respect to pp and, in particular in the backward rapidity region, the suppression is stronger than the $J/\psi$ one. This unexpected difference between the $J/\psi$ and $\psi (2S)$ behaviour, not accounted for by theoretical models based on nuclear parton shadowing and coherent energy loss mechanisms, indicates the presence of sizeable final state effects on the $\psi (2S)$ production.

4 pages, 6 figures, Proceedings of the "Quark Matter 2014 Conference", XXIV International Conference on Ultrarelativistic Nucleus-Nucleus Collisions, Darmstadt, May 19-24 2014

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• A Measurement of the Psi' to J/psi Production Ratio in 920 GeV Proton-Nucleus Interactions
• Centrality Dependence of Particle Production in p--A collisions measured by ALICE

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• Overview of ALICE Results at Quark Matter 2014
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• $\Psi (2S)$, ${\rm Y}(3S)$ Suppression in p-Pb, Pb-Pb Collisions and Mixed Hybrid Theory