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Measurement of nuclear modification factors of $\Upsilon$(1S), $\Upsilon$(2S), and $\Upsilon$(3S) mesons in PbPb collisions at $\sqrt{s_{_\mathrm{NN}}} =$ 5.02 TeV

The CMS collaboration
No Journal Information, 2018

Abstract (data abstract)
CERN-LHC. The cross sections for $\Upsilon(\mathrm{1S})$, $\Upsilon(\mathrm{2S})$, and $\Upsilon(\mathrm{3S})$ production in lead-lead (PbPb) and proton-proton (pp) collisions at $ {\sqrt {\smash [b]{s_{_{\mathrm {NN}}}}}} = $ 5.02 TeV have been measured using the CMS detector at the LHC. The nuclear modification factors, $ {R_{\mathrm{AA}}} $, derived from the PbPb-to-pp ratio of yields for each state, are studied as functions of meson rapidity and transverse momentum, as well as PbPb collision centrality. The yields of all three states are found to be significantly suppressed, and compatible with a sequential ordering of the suppression, $ {R_{\mathrm{AA}}}( \Upsilon(\mathrm{1S}) ) > {R_{\mathrm{AA}}}( \Upsilon(\mathrm{2S})) > {R_{\mathrm{AA}}} (\Upsilon(\mathrm{3S}) )$ . The suppression of $ \Upsilon(\mathrm{1S})$ is larger than that seen at $ {\sqrt {\smash [b]{s_{_{\mathrm {NN}}}}}} = $ 2.76 TeV, although the two are compatible within uncertainties. The upper limit on the ${R_{\mathrm{AA}}}$ of $ \Upsilon(\mathrm{3S})$ integrated over $ {p_{\mathrm{T}}} $ and rapidity and centrality is 0.096 at 95% confidence level, which is the strongest suppression observed for any hadron species in heavy ion collisions to date.

  • Table 1

    Data from Figure 2a

    10.17182/hepdata.83200.v2/t1

    Differential cross sections of the Y(1S) meson as a function of pT for pp collisions. The global uncertainty arises from...

  • Table 2

    Data from Figure 2a

    10.17182/hepdata.83200.v2/t2

    Differential cross sections of the Y(2S) meson as a function of pT for pp collisions. The global uncertainty arises from...

  • Table 3

    Data from Figure 2a

    10.17182/hepdata.83200.v2/t3

    Differential cross sections of the Y(3S) meson as a function of pT for pp collisions. The global uncertainty arises from...

  • Table 4

    Data from Figure 2b

    10.17182/hepdata.83200.v2/t4

    Differential cross sections of the Y(1S) meson as a function of pT for PbPb collisions. Global uncertainties arise from the...

  • Table 5

    Data from Figure 2b

    10.17182/hepdata.83200.v2/t5

    Differential cross sections of the Y(2S) meson as a function of pT for PbPb collisions. Global uncertainties arise from the...

  • Table 6

    Data from Figure 2b

    10.17182/hepdata.83200.v2/t6

    Differential cross sections of the Y(3S) meson as a function of pT for PbPb collisions.

  • Table 7

    Data from Figure 3a

    10.17182/hepdata.83200.v2/t7

    Differential cross sections of the Y(1S) meson as a function of rapidity for pp collisions. The global uncertainty arises from...

  • Table 8

    Data from Figure 3a

    10.17182/hepdata.83200.v2/t8

    Differential cross sections of the Y(2S) meson as a function of rapidity for pp collisions. The global uncertainty arises from...

  • Table 9

    Data from Figure 3a

    10.17182/hepdata.83200.v2/t9

    Differential cross sections of the Y(3S) meson as a function of rapidity for pp collisions. The global uncertainty arises from...

  • Table 10

    Data from Figure 3b

    10.17182/hepdata.83200.v2/t10

    Differential cross sections of the Y(1S) meson as a function of pT for PbPb collisions. Global uncertainties arise from the...

  • Table 11

    Data from Figure 3b

    10.17182/hepdata.83200.v2/t11

    Differential cross sections of the Y(2S) meson as a function of pT for PbPb collisions. Global uncertainties arise from the...

  • Table 12

    Data from Figure 3b

    10.17182/hepdata.83200.v2/t12

    Differential cross sections of the Y(3S) meson as a function of pT for PbPb collisions.

  • Table 13

    Data from Figure 4a

    10.17182/hepdata.83200.v2/t13

    Nuclear modification factor of the Y(1S) meson as a function of pT. Global uncertainty combines the uncertainties from TAA, pp...

  • Table 14

    Data from Figure 4a

    10.17182/hepdata.83200.v2/t14

    Nuclear modification factor of the Y(2S) meson as a function of pT. Global uncertainty combines the uncertainties from TAA, pp...

  • Table 15

    Data from Figure 4a

    10.17182/hepdata.83200.v2/t15

    Nuclear modification factor of the Y(3S) meson as a function of pT.

  • Table 16

    Data from Figure 4b

    10.17182/hepdata.83200.v2/t16

    Nuclear modification factor of the Y(1S) meson as a function of rapidity. Global uncertainty combines the uncertainties from TAA, pp...

  • Table 17

    Data from Figure 4a

    10.17182/hepdata.83200.v2/t17

    Nuclear modification factor of the Y(2S) meson as a function of rapidity. Global uncertainty combines the uncertainties from TAA, pp...

  • Table 18

    Data from Figure 4a

    10.17182/hepdata.83200.v2/t18

    Nuclear modification factor of the Y(3S) meson as a function of rapidity.

  • Table 19

    Data from Figure 5

    10.17182/hepdata.83200.v2/t19

    Nuclear modification factor of the Y(1S) meson as a function of collision centrality. Global uncertainty combines the pp luminosity and...

  • Table 20

    Data from Figure 5

    10.17182/hepdata.83200.v2/t20

    Nuclear modification factor of the Y(2S) meson as a function of collision centrality. Global uncertainty combines the pp luminosity and...

  • Table 21

    Data from Figure 5

    10.17182/hepdata.83200.v2/t21

    Confidence intervals on the nuclear modification factors of the Y(3S) mesons as a function of collision centrality.

  • Table 22

    Data from Figure 5

    10.17182/hepdata.83200.v2/t22

    Confidence intervals on the nuclear modification factors of the Y(2S) mesons as a function of collision centrality.

  • Table 23

    Data from Figure 5

    10.17182/hepdata.83200.v2/t23

    Nuclear modification factors of the Y(1S) and Y(2S) mesons in the integrated pT, rapidity and centrality.

Version 2 modifications: Fixing 3 typos in the last digit of some numbers in Table 19 (RAA vs centrality for Y(1S))

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