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Centrality dependence of $\mathbf{\psi}$(2S) suppression in p-Pb collisions at $\mathbf{\sqrt{{\textit s}_{\rm NN}}}$ = 5.02 TeV

The collaboration
JHEP 1606 (2016) 050, 2016

Abstract (data abstract)
CERN-LHC. The inclusive production of the $\psi$(2S) charmonium state was studied as a function of centrality in p-Pb collisions at the nucleon-nucleon center of mass energy $\sqrt{s_{\rm NN}}$ = 5.02 TeV at the CERN LHC. The measurement was performed with the ALICE detector in the center of mass rapidity ranges $-4.46<y_{\rm cms}<-2.96$ and $2.03<y_{\rm cms}<3.53$, down to zero transverse momentum, by reconstructing the $\psi$(2S) decay to a muon pair. The $\psi$(2S) production cross section $\sigma_{\psi(\rm 2S)}$ is presented as a function of the collision centrality, which is estimated through the energy deposited in forward rapidity calorimeters. The relative strength of nuclear effects on the $\psi$(2S) and on the corresponding 1S charmonium state J/$\psi$ is then studied by means of the double ratio of cross sections $[\sigma_{\psi(\rm 2S)}/\sigma_{\rm J/\psi}]_{\rm pPb}/[\sigma_{\psi(\rm 2S)}/\sigma_{\rm J/\psi}]_{\rm pp}$ between p-Pb and pp collisions, and by the values of the nuclear modification factors for the two charmonium states. The results show a large suppression of $\psi$(2S) production relative to the J/$\psi$ at backward rapidity, corresponding to the flight direction of the Pb-nucleus, while at forward rapidity the suppressions of the two states are comparable. Finally, comparisons to results from lower energy experiments and to available theoretical models are presented.

• #### Table 1

Data from Figure 2 Left

10.17182/hepdata.73306.v1/t1

Centrality-differential cross section dsigma_JPsi/dy in the backward and forward rapidity ranges (-4.46<y_cms<-2.96 and 2.03<y_cms<3.53). The first uncertainty is statistical, the...

• #### Table 2

Data from Figure 2 Right

10.17182/hepdata.73306.v1/t2

Centrality dependence of the Psi(2S)/J/Psi ratio in the backward and forward rapidity ranges (-4.46<y_cms<-2.96 and 2.03<y_cms<3.53). The first uncertainty is...

• #### Table 3

Data from Figure 3

10.17182/hepdata.73306.v1/t3

Centrality dependence of the (Psi(2S)/J/Psi)_pA/(Psi(2S)/J/Psi)_pp double ratio in the backward and forward rapidity range (-4.46<y_cms<-2.96 and 2.03<y_cms<3.53). The first uncertainty...

• #### Table 4

Data from Figure 4 Left (results in -4.46 <y< -2.96)

10.17182/hepdata.73306.v1/t4

Centrality dependence of the Psi(2S) Q_pPb in the backward rapidity range (-4.46<y_cms<-2.96). The first uncertainty is statistical, the second is...

• #### Table 5

Data from Figure 4 Right (results in 2.03 <y< 3.53)

10.17182/hepdata.73306.v1/t5

Centrality dependence of the Psi(2S) Q_pPb in the forward rapidity range (2.03<y_cms<3.53). The first uncertainty is statistical, the second is...

• #### Table 6

Data from Figure 5 (results for the backward rapidity region -4.46<y_cms<-2.96)

10.17182/hepdata.73306.v1/t6

Psi(2S)/J/Psi)_pA/(Psi(2S)/J/Psi)_pp double ratio in the backward rapidity range (-4.46<y_cms<-2.96) plotted as a function of the crossing time. The first uncertainty...

• #### Table 7

Data from Figure 5 (results for the forward rapidity region 2.03<y_cms<3.53)

10.17182/hepdata.73306.v1/t7

Psi(2S)/J/Psi)_pA/(Psi(2S)/J/Psi)_pp double ratio in the forward rapidity range (2.03<y_cms<3.53) plotted as a function of the crossing time. The first uncertainty...