Forward rapidity $\psi (2S)$ meson production in pp, p-Pb and Pb-Pb collisions with ALICE at the LHC

Abstract

The ALICE Collaboration has studied the inclusive $\psi (2S)$ meson production in pp, p-Pb and Pb-Pb collisions at the CERN LHC. The $\psi (2S)$ is detected through its decay to a muon pair, using the forward Muon Spectrometer, which covers the pseudo-rapidity range $-4<\eta <-2.5$. The $\psi (2S)$ production cross sections in pp collisions are presented as a function of rapidity (y) and transverse momentum ($p_{\mathrm{T}}$). In p-Pb collisions, $\psi (2S)$ results are compared to the J/$\psi$ ones by the ratio of their production cross sections as a function of rapidity, transverse momentum and event activity. The $\psi (2S)$ nuclear modification factor, $R_{\mathrm{pA}}$, is also discussed. The results show a $\psi (2S)$ suppression compared to the one observed for the J/$\psi$ meson and are not described by theoretical models including cold nuclear matter effects as nuclear shadowing and energy loss. Finally, the preliminary results of $\psi (2S)$ meson production in Pb-Pb collisions are shown in two $p_{\mathrm{T}}$ ranges as a function of the collision centrality.

References in corpus (5)

• Heavy quarkonium: progress, puzzles, and opportunities
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• Predictions for $p+$Pb Collisions at sqrt s_NN = 5 TeV
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• Measurement of prompt psi(2S) to J/psi yield ratios in PbPb and pp collisions at sqrt(s[NN]) = 2.76 TeV