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Centrality and transverse momentum dependence of inclusive J/$\psi$ production at midrapidity in Pb-Pb collisions at $\sqrt{s_{\rm NN}}$ = 5.02 TeV

The collaboration
Phys.Lett.B 805 (2020) 135434, 2020.

Abstract (data abstract)
CERN-LHC. The inclusive J/$\psi$ meson production in Pb--Pb collisions at a center-of-mass energy per nucleon--nucleon collision of $\sqrt{s_{\rm NN}} = 5.02$~TeV at midrapidity ($|y| < 0.9$) is reported by the ALICE Collaboration. The measurements are performed in the dielectron decay channel, as a function of event centrality and J/$\psi$ transverse momentum $p_{\rm T}$, down to $p_{\rm T}=0$~GeV/$c$. The J/$\psi$ mean transverse momentum $\langle p_{\rm T} \rangle$ and $r_{\rm AA}$ ratio, defined as $\langle p^{2}_{\rm T}\rangle_{\text{PbPb}} / \langle p^{2}_{\rm T} \rangle_{\rm pp}$, are evaluated. Both observables show a centrality dependence decreasing towards central (head-on) collisions. The J/$\psi$ nuclear modification factor $R_{\rm AA}$ exhibits a strong $p_{\rm T}$ dependence with a large suppression at high $p_{\rm T}$ and an increase to unity for decreasing $p_{\rm T}$. When integrating over the measured momentum range $p_{\rm T}<10$~GeV/$c$, the J/$\psi$ $R_{\rm AA}$ shows a weak centrality dependence. Each measurement is compared with results at lower center-of-mass energies and with ALICE measurements at forward rapidity, as well as to theory calculations. All reported features of the J/$\psi$ production at low $p_{\rm T}$ are consistent with a dominant contribution to the J/$\psi$ yield originating from charm quark (re)combination.

• #### Table 1

Data from Figure 3 (left)

10.17182/hepdata.94384.v1/t1

Transverse momentum dependence of the inclusive J/$\psi$ yields in Pb$-$Pb collisions at $\sqrt{s_{\rm NN}} = 5.02$ TeV at midrapidity in...

• #### Table 2

Data from Figure 4 (left, red, full circle)

10.17182/hepdata.94384.v1/t2

Inclusive J/$\psi$ $\langle p_{\rm T} \rangle$ in Pb$-$Pb collisions at $\sqrt{s_{\rm NN}} = 5.02$ TeV at midrapidity as a function...

• #### Table 3

Data from Figure 4 (right, red, full circle)

10.17182/hepdata.94384.v1/t3

Inclusive J/$\psi$ $r_{\rm AA} = \langle p^{2}_{\rm T} \rangle_{\rm PbPb} / \langle p^{2}_{\rm T} \rangle_{\rm pp}$ in Pb$-$Pb collisions at...

• #### Table 4

Data from Figure 6 (left, red, full circle)

10.17182/hepdata.94384.v1/t4

Inclusive J/$\psi$ nuclear modification factor $R_{\rm AA}$ at midrapidity, integrated over $p_{\rm T}$, as a function of mean number of...

• #### Table 5

Data from Figure 6 (right, red, full circle)

10.17182/hepdata.94384.v1/t5

Inclusive J/$\psi$ nuclear modification factor $R_{\rm AA}$ at midrapidity for $p_{\rm T} > 0.15$ GeV as a function of mean...

• #### Table 6

Data from Figure 7 (left)

10.17182/hepdata.94384.v1/t6

Inclusive J/$\psi$ nuclear modification factor, $R_{\rm AA}$, at midrapidity in Pb$-$Pb collisions at $\sqrt{s_{\rm NN}} = 5.02$ TeV as a...

• #### Table 7

Data from Figure 8 (right, red, full circle)

10.17182/hepdata.94384.v1/t7

Nuclear modification factor $R_{\rm AA}$ of inclusive J/$\psi$ at mid-rapidity. For the midrapidity point all normalization uncertainties are included.