J/$\psi$ suppression at forward rapidity in Pb-Pb collisions at $\sqrt{s_{\mathrm{NN}}}=5.02$ TeV

Abstract

The inclusive J/$\psi$ production has been studied in Pn-Pb and pp collisions at the centre-of-mass energy per nucleon pair $\sqrt{s_{\mathrm{NN}}}=5.02$ TeV, using the ALICE detector at the CERN LHC. The J/$\psi$ meson is reconstructed, in the centre-of-mass rapidity interval $2.5<y<4$ and in the transverse-momentum range $p_{\mathrm{T}}<12$ GeV/$c$, via its decay to a muon pair. In this Letter, we present results on the inclusive J/$\psi$ cross section in pp collisions at $\sqrt{s}=5.02$ TeV and on the nuclear modification factor $R_{\mathrm{AA}}$. The latter is presented as a function of the centrality of the collision and, for central collisions, as a function of the transverse momentum $p_{\mathrm{T}}$ of the J/$\psi$. The measured $R_{\mathrm{AA}}$ values indicate a suppression of the J/$\psi$ in nuclear collisions and are then compared to our previous results obtained in Pb-Pb collisions at $\sqrt{s_{\mathrm{NN}}}=2.76$ TeV. The ratio of the $R_{\mathrm{AA}}$ values at the two energies is also computed and compared to calculations of statistical and dynamical models. The numerical value of the ratio for central events (0-10\% centrality) is $1.17\pm 0.04(\mathrm{stat})\pm 0.20(\mathrm{syst})$. In central events, as a function of $p_{\mathrm{T}}$, a slight increase of $R_{\mathrm{AA}}$ with collision energy is visible in the region $2<p_{\mathrm{T}}<6$ GeV/$c$. Theoretical calculations provide a good description of the measurements, within uncertainties.

arXiv comment23 pages, 6 captioned pages, 1 table, authors from page 18, published version, figures at http://aliceinfo.cern.ch/ArtSubmission/node/2944

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