Speaker
Marco Leoncino
(University of Turin and INFN (IT))
Description
The ALICE Collaboration has studied the inclusive $\mathrm{J}/\psi$ and $\psi(\mathrm{2S})$ production in p-Pb collisions at the nucleon-nucleon centre of mass energy $\sqrt{s_{NN}}=5.02$ TeV at the CERN LHC. The strongly bound $\mathrm{J}/\psi$ and the loosely bound $\psi(\mathrm{2S})$ are detected through their decays to muon pairs in two configurations with inverted beam directions, with the following rapidity coverages:$-4.46 < y_{cms} < -2.96$ (Pb-going direction) at backward rapidity and $2.03 < y_{cms} < 3.53$ (p-going direction) at forward rapidity. The $\mathrm{J}/\psi$ production is also studied in the mid-rapidity interval $-1.37 < y_{cms} < 0.43$ in the dielectron decay channel. The $\mathrm{J}/\psi$ and $\psi(\mathrm{2S})$ nuclear modification factors, $R_{pA}$, will be presented as a function of transverse momentum, rapidity and collision centrality; the $\mathrm{J}/\psi$ forward-to-backward ratios and the average $p_{T}^2$ values will be also reported. Notably, the $\psi(\mathrm{2S})$ suppression is larger than the one observed for the $\mathrm{J}/\psi$ and is not described by theoretical models including only nuclear shadowing and coherent energy loss as cold nuclear matter effects. Moreover, results show that the relative $\psi(\mathrm{2S})$ suppression relative to $\mathrm{J}/\psi$ grows towards central collisions (especially at backward rapidity). We will also show the $\psi(\mathrm{2S})$/$\mathrm{J}/\psi$ ratio as a function of transverse momentum, rapidity and centrality. Our measurements will be discussed together with results of recent theoretical calculations.
| On behalf of collaboration: | ALICE |
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Author
Marco Leoncino
(University of Turin and INFN (IT))
