Inclusive J/$\psi$ and $\psi$(2S) production in pp and p-Pb collisions at forward rapidity with ALICE at the LHC

Abstract

The ALICE collaboration has studied inclusive J/$\psi$ and $\psi$(2S) production at forward rapidities in pp collisions at $\sqrt{s}=7$ TeV with the ALICE Muon Spectrometer. The analysis has been carried out on a data sample corresponding to an integrated luminosity ${\mathcal{L}}_{\mathrm{int}}$ = 1.35 pb${}^{-1}$. The production cross-sections of J/$\psi$ and $\psi$(2S), integrated over the transverse momentum (0 $<$ $p_{\mathrm{T}}$ $<$ 20 GeV/$c$) and rapidity (2.5 $<$ $y$ $<$ 4), have been measured. The J/$\psi$ and $\psi$(2S) differential cross-sections, in transverse momentum and rapidity, have also been measured, significantly extending the $p_{\mathrm{T}}$ reach of previous measurements performed in the same $y$-range. The results have been compared with the previously published ALICE results (${\mathcal{L}}_{\mathrm{int}}$ = 15.6 nb${}^{-1}$) and also with the measurement performed by the LHCb collaboration. The $\psi$(2S)/J/$\psi$ ratio, integrated over $p_{\mathrm{T}}$ and $y$, has been measured. This ratio has also been evaluated as a function of transverse momentum and rapidity and compared with the LHCb measurement. Finally, recent results on cross-sections, $\psi$(2S)/J/$\psi$ production ratio, nuclear modification factor ($R_{\mathrm{pPb}}$) and forward-to-backward yield ratio ($R_{\mathrm{FB}}$) in p-Pb collisions at $\sqrt{s_{\mathrm{NN}}}=5.02$ TeV will be discussed.

arXiv comment8 pages, 11 figures, contribution to the proceedings of the International Conference on Matter at Extreme Conditions : Then & Now, Bose Institute, Kolkata, India, January 15-17, 2014