Suppression of $\psi$(2S) production in p-Pb collisions at $\sqrt{s_{\mathrm{NN}}}$ = 5.02 TeV

Abstract

The ALICE Collaboration has studied the inclusive production of the charmonium state $\psi (2S)$ in proton-lead (p-Pb) collisions at the nucleon-nucleon centre of mass energy $\sqrt{s_{NN}}$ = 5.02 TeV at the CERN LHC. The measurement was performed at forward ($2.03<y_{cms}<3.53$) and backward ($-4.46<y_{cms}<-2.96$) centre of mass rapidities, studying the decays into muon pairs. In this paper, we present the inclusive production cross sections ${\sigma }_{\psi (2S)}$, both integrated and as a function of the transverse momentum $p_T$, for the two $y_{cms}$ domains. The results are compared to those obtained for the 1S vector state (J/$\psi$), by showing the ratios between the production cross sections, as well as the double ratios $[{\sigma }_{\psi (2S)}/{\sigma }_{J/\psi }{]}_{pPb}/[{\sigma }_{\psi (2S)}/{\sigma }_{J/\psi }{]}_{pp}$ between p-Pb and proton-proton collisions. Finally, the nuclear modification factor for inclusive $\psi (2S)$ is evaluated and compared to the measurement of the same quantity for J/$\psi$ and to theoretical models including parton shadowing and coherent energy loss mechanisms. The results show a significantly larger suppression of the $\psi (2S)$ compared to that measured for J/$\psi$ and to models. These observations represent a clear indication for sizeable final state effects on $\psi (2S)$ production.

21 pages, 8 captioned figures, 1 table, authors from page 16, published version, figures at http://aliceinfo.cern.ch/ArtSubmission/node/1722

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