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 collaboration
Phys.Lett.B 790 (2019) 270-293, 2019.

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

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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

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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

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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

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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

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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

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

• #### Table 7

Data from Figure 3a

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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

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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

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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

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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

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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

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

• #### Table 13

Data from Figure 4a

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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

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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

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

• #### Table 16

Data from Figure 4b

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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

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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

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

• #### Table 19

Data from Figure 5

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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

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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

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

• #### Table 22

Data from Figure 5

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

• #### Table 23

Data from Figure 5

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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))