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

The collaboration
No Journal Information, 2016

Abstract (data abstract)
CERN-LHC. The inclusive J/$\psi$ production has been studied in Pb-Pb and pp collisions at the centre-of-mass energy per nucleon pair $\sqrt{s_{\rm NN}}=5.02$ 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 $p_{\rm T}<12$ 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 $R_{\rm AA}$. The latter is presented as a function of the centrality of the collision and, for central collisions, as a function of the transverse momentum $p_{\rm T}$ of the J/$\psi$. The measured $R_{\rm AA}$ values are compared to our previous results obtained in \pbpb collisions at $\sqrt{s_{\rm NN}}=2.76$~TeV. The ratio of the $R_{\rm AA}$ 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 $1.17 \pm 0.04 {\rm{(stat.)}}\pm 0.20 {\rm{(syst.)}}$. In central events, as a function of $p_{\rm T}$, a slight increase of $R_{\rm AA}$ with collision energy is visible in the region $2<p_{\rm T}<6$ GeV/$c$. Theoretical calculations qualitatively describe the measurements, within uncertainties.

• #### Table 1

Data from Figure 2

10.17182/hepdata.76790.v1/t1

Differential cross section ${\rm d}^2\sigma^{\rm pp}_{{\rm J}/\psi}/{\rm d}y{\rm d}p_{\rm T}$ for inclusive J/$\psi$ cross section in pp collisions at $\sqrt{s}=5.02$...

• #### Table 2

Data from Figure 3

10.17182/hepdata.76790.v1/t2

The nuclear modification factor for inclusive J/$\psi$ production, as a function of centrality, at $\sqrt{s_{\rm NN}}=5.02$ TeV. The widths of...

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Data from Figure 4

10.17182/hepdata.76790.v1/t3

Centrality dependence (with 10% width centrality classes) of the inclusive J/$\psi$ $R_{\rm AA}$ for $0.3<p_{\rm T}<8$ GeV/$c$. The first uncertainty...

• #### Table 4

Data from Figure 5

10.17182/hepdata.76790.v1/t4

Centrality dependence (with 10% width centrality classes) of the ratio of the inclusive J/$\psi$ $R_{\rm AA}$ for $0.3<p_{\rm T}<8$ GeV/$c$...

• #### Table 5

Data from Figure 6 (top)

10.17182/hepdata.76790.v1/t5

Transverse momentum dependence (in 0-20% centrality class) of the inclusive J/$\psi$ $R_{\rm AA}$. The first uncertainty is statistical, the second...

• #### Table 6

Data from Figure 6 (bottom)

10.17182/hepdata.76790.v1/t6

Transverse momentum dependence (in 0-20% centrality class) of the double ratio of the inclusive J/$\psi$ $R_{\rm AA}$ at $\sqrt{s_{NN}}$= 5.02...