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Centrality dependence of J/$\psi$ and $\psi$(2S) production and nuclear modification in p-Pb collisions at $\sqrt{s_{\rm NN}} =$ 8.16 TeV

The ALICE collaboration
JHEP 02 (2021) 002, 2021.

Abstract (data abstract)
The inclusive production of the J/$\psi$ and $\psi$(2S) charmonium states is studied as a function of centrality in p--Pb collisions at a centre-of-mass energy per nucleon pair $\sqrt{s_{\rm NN}} = 8.16$ TeV at the LHC. The measurement is performed in the dimuon decay channel with the ALICE apparatus in the centre-of-mass rapidity intervals $-4.46 < y_{\rm cms} < -2.96$ (Pb-going direction) and $2.03 < y_{\rm cms} < 3.53$ (p-going direction), down to zero transverse momentum ($p_{\rm T}$). The J/$\psi$ and $\psi$(2S) production cross sections are evaluated as a function of the collision centrality, estimated through the energy deposited in the zero degree calorimeter located in the Pb-going direction. The $p_{\rm T}$-differential J/$\psi$ production cross section is measured at backward and forward rapidity for several centrality classes, together with the corresponding average $\langle p_{\rm T} \rangle$ and $\langle p^{2}_{\rm T} \rangle$ values. The nuclear effects affecting the production of both charmonium states are studied using the nuclear modification factor. In the p-going direction, a suppression of the production of both charmonium states is observed, which seems to increase from peripheral to central collisions. In the Pb-going direction, however, the centrality dependence is different for the two states ':' the nuclear modification factor of the J/$\psi$ increases from below unity in peripheral collisions to above unity in central collisions, while for the $\psi$(2S) it stays below or consistent with unity for all centralities with no significant centrality dependence. The results are compared with measurements in p--Pb collisions at $\sqrt{s_{\rm NN}} = 5.02$ TeV and no significant dependence on the energy of the collision is observed. Finally, the results are compared with theoretical models implementing various nuclear matter effects.

  • Table 1

    Data from Figure 2 (Left)

    10.17182/hepdata.100166.v1/t1

    The $p_{\rm T}$-differential inclusive J/$\psi$ cross sections for six centrality classes at backward ($-4.46 < y_{\rm cms} < -2.96$) centre-of-mass...

  • Table 2

    Data from Figure 2 (Right)

    10.17182/hepdata.100166.v1/t2

    The $p_{\rm T}$-differential inclusive J/$\psi$ cross sections for six centrality classes at forward ($2.03 < y_{\rm cms} < 3.53$) centre-of-mass...

  • Table 3

    Data from Table 3

    10.17182/hepdata.100166.v1/t3

    The values of $\langle p_{\rm T} \rangle$ and $\langle p^{2}_{\rm T} \rangle$ for six centrality classes at backward ($-4.46 <...

  • Table 4

    Data from Figure 3

    10.17182/hepdata.100166.v1/t4

    The values of $\Delta \langle p^{2}_{\rm T}\rangle$ as a function of centrality at backward ($-4.46 < y_{\rm cms} < -2.96$)...

  • Table 5

    Data from Figure 4

    10.17182/hepdata.100166.v1/t5

    The nuclear modification factor ($Q_{\rm pPb}$) of inclusive J/$\psi$ as function of $\langle N_{\rm coll} \rangle$ at backward ($-4.46 <...

  • Table 6

    Data from Figure 5 (Left) and Figure 7

    10.17182/hepdata.100166.v1/t6

    The $p_{\rm T}$-differential inclusive J/$\psi$ $Q_{\rm pPb}$ for six centrality classes at backward ($-4.46 < y_{\rm cms} < -2.96$) centre-of-mass...

  • Table 7

    Data from Figure 5 (Right) and Figure 8

    10.17182/hepdata.100166.v1/t7

    The $p_{\rm T}$-differential inclusive J/$\psi$ $Q_{\rm pPb}$ for six centrality classes at forward ($2.03 < y_{\rm cms} < 3.53$) centre-of-mass...

  • Table 8

    Data from Figure 6 (Left)

    10.17182/hepdata.100166.v1/t8

    The ratio of inclusive J/$\psi$ $Q_{\rm pPb}$ between peripheral to central collisions ($Q_{\rm PC}$) as function of $p_{\rm T}$ for...

  • Table 9

    Data from Figure 6 (Right)

    10.17182/hepdata.100166.v1/t9

    The ratio of inclusive J/$\psi$ $Q_{\rm pPb}$ between peripheral to central collisions ($Q_{\rm PC}$) as a function of $p_{\rm T}$...

  • Table 10

    Data from Figure 9 (Left)

    10.17182/hepdata.100166.v1/t10

    B.R.$_{\psi(\rm 2S)\rightarrow\mu^{+}\mu^{-}}{\sigma_{\psi(\rm 2S)}}$/B.R.$_{J/\psi\rightarrow\mu^{+}\mu^{-}}{\sigma_{\rm J/\psi}}$ as a function of $\langle N_{\rm coll} \rangle$ at backward ($-4.46 < y_{\rm cms} < -2.96$)...

  • Table 11

    Data from Figure 9 (Right)

    10.17182/hepdata.100166.v1/t11

    B.R.$_{\psi(\rm 2S)\rightarrow\mu^{+}\mu^{-}}{\sigma_{\psi(\rm 2S)}}$/B.R.$_{J/\psi\rightarrow\mu^{+}\mu^{-}}{\sigma_{\rm J/\psi}}$ as a function of $\langle N_{\rm coll} \rangle$ at forward ($2.03 < y_{\rm cms} < 3.53$)...

  • Table 12

    Data from Figure 10 (Left)

    10.17182/hepdata.100166.v1/t12

    Double ratio $[\sigma_{\psi(\rm 2S)}/\sigma_{\rm J/\psi}]_{\rm pPb}/[\sigma_{\psi(\rm 2S)}/\sigma_{\rm J/\psi}]_{\rm pp}$ as a function of $\langle N_{\rm coll} \rangle$ at backward ($-4.46...

  • Table 13

    Data from Figure 10 (Right)

    10.17182/hepdata.100166.v1/t13

    Double ratio $[\sigma_{\psi(\rm 2S)}/\sigma_{\rm J/\psi}]_{\rm pPb}/[\sigma_{\psi(\rm 2S)}/\sigma_{\rm J/\psi}]_{\rm pp}$ as a function of $\langle N_{\rm coll} \rangle$ at forward ($2.03...

  • Table 14

    Data from Figure 11 (Left)

    10.17182/hepdata.100166.v1/t14

    Inclusive $\psi$(2S) $Q_{\rm pPb}$ as a function of $\langle N_{\rm coll} \rangle$ at backward ($-4.46 < y_{\rm cms} < -2.96$)...

  • Table 15

    Data from Figure 11 (Right)

    10.17182/hepdata.100166.v1/t15

    Inclusive $\psi$(2S) $Q_{\rm pPb}$ as a function of $\langle N_{\rm coll} \rangle$ at forward ($2.03 < y_{\rm cms} < 3.53$)...

  • Table 16

    Extrapolated values from Figure 1 (in red) of ALICE-PUBLIC-2020-007

    10.17182/hepdata.100166.v1/t16

    Inclusive J/$\psi$ cross sections extrapolated from existing measurements at backward ($-4.46 < y < -2.96$) and forward ($2.03 < y...

  • Table 17

    Extrapolated values from Figure 1 (in blue) of ALICE-PUBLIC-2020-007

    10.17182/hepdata.100166.v1/t17

    Inclusive $\psi$(2S) cross sections extrapolated from existing measurements at backward ($-4.46 < y < -2.96$) and forward ($2.03 < y...

  • Table 18

    Extrapolated values from Figure 2 of ALICE-PUBLIC-2020-007

    10.17182/hepdata.100166.v1/t18

    The rapidity differential inclusive J/$\psi$ cross sections extrapolated from existing measurements for backward ($-4.46 < y < -2.96$) rapidity interval...

  • Table 19

    Extrapolated values from Figure 2 of ALICE-PUBLIC-2020-007

    10.17182/hepdata.100166.v1/t19

    The rapidity differential inclusive J/$\psi$ cross sections extrapolated from existing measurements for forward ($2.03 < y < 3.53$) rapidity interval...

  • Table 20

    Extrapolated values from Figure 3 (in blue) of ALICE-PUBLIC-2020-007

    10.17182/hepdata.100166.v1/t20

    The $p_{\rm T}$-differential inclusive J/$\psi$ cross sections extrapolated from existing measurements at backward ($-4.46 < y < -2.96$) rapidity in...

  • Table 21

    Extrapolated values from Figure 3 (in red) of ALICE-PUBLIC-2020-007

    10.17182/hepdata.100166.v1/t21

    The $p_{\rm T}$-differential inclusive J/$\psi$ cross sections extrapolated from existing measurements at forward ($2.03 < y < 3.53$) rapidity in...

  • Table 22

    Extrapolated values from Figure 4 of ALICE-PUBLIC-2020-007

    10.17182/hepdata.100166.v1/t22

    The values of $\langle p_{\rm T} \rangle$ and $\langle p^{2}_{\rm T} \rangle$ of inclusive J/$\psi$ at backward ($-4.46 < y...

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