• Browse all
Measurement of nuclear effects on $\psi\rm{(2S)}$ production in p-Pb collisions at $\sqrt{\textit{s}_{\rm NN}} = 8.16$ TeV

The ALICE collaboration
JHEP 07 (2020) 237, 2020.

Abstract (data abstract)
Inclusive $\psi(2{\rm S})$ production is measured in \ppb collisions at the centre-of-mass energy per nucleon--nucleon pair $\sqrt{s_{_{\rm NN}}}=8.16$ TeV, using the ALICE detector at the CERN LHC. The production of $\psi(2{\rm S})$ is studied at forward ($2.03 < y_{\rm cms} < 3.53$) and backward ($-4.46 < y_{\rm cms} < -2.96$) centre-of-mass rapidity and for transverse momentum \pt $<$ 12 \gevc via the decay to muon pairs. In this paper, we report the integrated as well as the $y_{\rm cms}$- and $p_{\rm T}$-differential inclusive production cross sections. Nuclear effects on $\psi(2{\rm S})$ production are studied via the determination of the nuclear modification factor that shows a strong suppression at both forward and backward centre-of-mass rapidities. Comparisons with corresponding results for inclusive J$/psi$ show a similar suppression for the two states at forward rapidity (p-going direction), but a stronger suppression for $\psi(2{\rm S})$ at backward rapidity (Pb-going direction). As a function of $p_{\rm T}$, no clear dependence of the nuclear modification factor is found. The relative size of nuclear effects on $\psi(2{\rm S})$ production compared to J$/psi$ is also studied via the double ratio of production cross sections $[\sigma_{\psi({\rm 2S})}/\sigma_{{\rm J/}\psi}]_{\rm pPb}/[\sigma_{\psi({\rm 2S})}/\sigma_{{\rm J/}\psi}]_{\rm pp}$ between \ppb and \pp collisions. The results are compared with theoretical models that include various effects related to the initial and final state of the collision system and also with previous measurements at $\sqrt{s_{_{\rm NN}}}=5.02$ TeV.

  • Table 1

    Data from Figure 2

    10.17182/hepdata.96029.v1/t1

    Inclusive $\psi(2{\rm S})$ differential cross section times branching ratio as a function of $y_{\rm cms}$, in p--Pb collisions at $\sqrt{s_{\rm...

  • Table 2

    Data from Figure 3 (Left)

    10.17182/hepdata.96029.v1/t2

    Inclusive $\psi(2{\rm S})$ differential cross section times branching ratio as a function of $p_{\rm T}$, at forward rapidity at $\sqrt{s_{\rm...

  • Table 3

    Data from Figure 3 (Right)

    10.17182/hepdata.96029.v1/t3

    Inclusive $\psi(2{\rm S})$ differential cross section times branching ratio as a function of $p_{\rm T}$, at backward rapidity at $\sqrt{s_{\rm...

  • Table 4

    Data from Figure 4

    10.17182/hepdata.96029.v1/t4

    Ratio of inclusive $\psi(2{\rm S})$ over J/$\psi$ yields times their branching ratios as a function of $y_{\rm cms}$ in p--Pb...

  • Table 5

    Data from Figure 5 (Left)

    10.17182/hepdata.96029.v1/t5

    Ratio of inclusive $\psi(2{\rm S})$ over J/$\psi$ yields times their branching ratios as a function of $p_{\rm T}$ in p--Pb...

  • Table 6

    Data from Figure 5 (Right)

    10.17182/hepdata.96029.v1/t6

    Ratio of inclusive $\psi(2{\rm S})$ over J/$\psi$ yields times their branching ratios as a function of $p_{\rm T}$ in p--Pb...

  • Table 7

    Data from Figure 6 (Left and Right) and Figure 8

    10.17182/hepdata.96029.v1/t7

    Inclusive $\psi(2{\rm S})$ $R_{\rm pPb}$ values as a function of $y_{\rm {cms}}$ at $\sqrt{s_{\rm NN}}$ = 8.16 TeV. The first...

  • Table 8

    Data from Figure 7 and Figure 9 (Left)

    10.17182/hepdata.96029.v1/t8

    Inclusive $\psi(2{\rm S})$ $R_{\rm pPb}$ values as a function of $p_{\rm T}$ at $\sqrt{s_{\rm NN}}$ = 8.16 TeV at forward...

  • Table 9

    Data from Figure 7 and Figure 9 (Right)

    10.17182/hepdata.96029.v1/t9

    Inclusive $\psi(2{\rm S})$ $R_{\rm pPb}$ values as a function of $p_{\rm T}$ at $\sqrt{s_{\rm NN}}$ = 8.16 TeV at backward...

  • Table 10

    Data from Figure 10

    10.17182/hepdata.96029.v1/t10

    Double ratio of $\psi$(2S) and J/$\psi$ cross sections in p--Pb and pp collisions as a function of rapidity, at $\sqrt{s_{\mathrm{NN}}}...

  • Table 11

    Data from Figure 11 (Left)

    10.17182/hepdata.96029.v1/t11

    Double ratio of $\psi$(2S) and J/$\psi$ cross sections in p--Pb and pp collisions as a function of $p_{\rm T}$, at...

  • Table 12

    Data from Figure 11 (Right)

    10.17182/hepdata.96029.v1/t12

    Double ratio of $\psi$(2S) and J/$\psi$ cross sections in p--Pb and pp collisions as a function of $p_{\rm T}$, at...

  • Table 13

    No Figure

    10.17182/hepdata.96029.v1/t13

    Inclusive $\psi(2{\rm S})$ cross section times branching ratio for backward and forward rapidity, in p--Pb collisions at $\sqrt{s_{\rm NN}}$ =...

  • Table 14

    No Figure

    10.17182/hepdata.96029.v1/t14

    Inclusive $\psi(2{\rm S})$ $R_{\rm pPb}$ values for backward and forward rapidity at $\sqrt{s_{\rm NN}}$ = 8.16 TeV. The first uncertainty...

Loading Data...

Ask a Question


Your question will be emailed to those involved with the submission. Please mention the relevant table.


Please log in to HEPData to send a question.