Nuclear modification of $\Upsilon$ states in pPb collisions at $\sqrt{s_\mathrm{NN}}$ = 5.02 TeV

The collaboration
Phys.Lett.B 835 (2022) 137397, 2022.

Abstract (data abstract)
Production cross sections of $\Upsilon(1S)$, $\Upsilon(2S)$, and $\Upsilon(3S)$ states decaying into $\mu^{+}\mu^{-}$ in proton-lead (pPb) collisions are reported using data collected by the CMS experiment at $\sqrt{s_{_{\mathrm{NN}}}} =$ 5.02 TeV. A comparison is made with corresponding cross sections obtained with pp data measured at the same collision energy and scaled by the Pb nucleus mass number. The nuclear modification factor for $\Upsilon(1S)$ is found to be $R_{\mathrm{pPb}}(\Upsilon(1S)) =$ 0.806 $\pm\$ 0.024 (stat) $\pm\$ 0.059 (syst). Similar results for the excited states indicate a sequential suppression pattern, such that $R_{\mathrm{pPb}}(\Upsilon(1S)) > R_{\mathrm{pPb}}(\Upsilon(2S)) > R_{\mathrm{pPb}}(\Upsilon(3S))$. The suppression is much less pronounced in pPb than in PbPb collisions, and independent of transverse momentum $p^{\Upsilon}_{T}$ and center-of-mass rapidity $y^{\Upsilon}_{CM}$ of the individual $\Upsilon$ state in the studied range $p^{\Upsilon}_{T} <$ 30 GeV/c and $|y^{\Upsilon}_{CM}| <$ 1.93. Models that incorporate sequential suppression of bottomonia in pPb collisions are in better agreement with the data than those which only assume initial-state modifications.

• #### Table 1

Data from Figure 2 (upper left)

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Differential cross section times dimuon branching fraction of Y(1S) as a function of pT in pPb collisions. The global uncertainty...

• #### Table 2

Data from Figure 2 (upper left)

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Differential cross section times dimuon branching fraction of Y(2S) as a function of pT in pPb collisions. The global uncertainty...

• #### Table 3

Data from Figure 2 (upper left)

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Differential cross section times dimuon branching fraction of Y(3S) as a function of pT in pPb collisions. The global uncertainty...

• #### Table 4

Data from Figure 2 (upper right)

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Differential cross section times dimuon branching fraction of Y(1S) as a function of $y^{Y}_{CM}$ in pPb collisions. The global uncertainty...

• #### Table 5

Data from Figure 2 (upper right)

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Differential cross section times dimuon branching fraction of Y(2S) as a function of $y^{Y}_{CM}$ in pPb collisions. The global uncertainty...

• #### Table 6

Data from Figure 2 (upper right)

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Differential cross section times dimuon branching fraction of Y(3S) as a function of $y^{Y}_{CM}$ in pPb collisions. The global uncertainty...

• #### Table 7

Data from Figure 2 (lower left)

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Differential cross section times dimuon branching fraction of Y(1S) as a function of pT in pp collisions. The global uncertainty...

• #### Table 8

Data from Figure 2 (lower left)

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Differential cross section times dimuon branching fraction of Y(2S) as a function of pT in pp collisions. The global uncertainty...

• #### Table 9

Data from Figure 2 (lower left)

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Differential cross section times dimuon branching fraction of Y(3S) as a function of pT in pp collisions. The global uncertainty...

• #### Table 10

Data from Figure 2 (lower right)

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Differential cross section times dimuon branching fraction of Y(1S) as a function of $|y^{Y}_{CM}|$ in pp collisions. The global uncertainty...

• #### Table 11

Data from Figure 2 (lower right)

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Differential cross section times dimuon branching fraction of Y(2S) as a function of $|y^{Y}_{CM}|$ in pp collisions. The global uncertainty...

• #### Table 12

Data from Figure 2 (lower right)

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Differential cross section times dimuon branching fraction of Y(3S) as a function of $|y^{Y}_{CM}|$ in pp collisions. The global uncertainty...

• #### Table 13

Data from Figure 3 (left)

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Nuclear modification factor of Y(1S) as a function of pT. The global uncertainty arises from the integrated luminosity uncertainties in...

• #### Table 14

Data from Figure 3 (left)

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Nuclear modification factor of Y(2S) as a function of pT. The global uncertainty arises from the integrated luminosity uncertainties in...

• #### Table 15

Data from Figure 3 (left)

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Nuclear modification factor of Y(3S) as a function of pT. The global uncertainty arises from the integrated luminosity uncertainties in...

• #### Table 16

Data from Figure 3 (right)

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Nuclear modification factor of Y(1S) as a function of $y^{Y}_{CM}$. The global uncertainty arises from the integrated luminosity uncertainties in...

• #### Table 17

Data from Figure 3 (right)

10.17182/hepdata.88291.v1/t17

Nuclear modification factor of Y(2S) as a function of $y^{Y}_{CM}$. The global uncertainty arises from the integrated luminosity uncertainties in...

• #### Table 18

Data from Figure 3 (right)

10.17182/hepdata.88291.v1/t18

Nuclear modification factor of Y(3S) as a function of $y^{Y}_{CM}$. The global uncertainty arises from the integrated luminosity uncertainties in...

• #### Table 19

Data from Figure 6 (left)

10.17182/hepdata.88291.v1/t19

Nuclear modification factor of Y(1S) at forward and backward $y^{Y}_{CM}$ for pT < 6 GeV/c. The global uncertainty arises from...

• #### Table 20

Data from Figure 6 (left)

10.17182/hepdata.88291.v1/t20

Nuclear modification factor of Y(2S) at forward and backward $y^{Y}_{CM}$ for pT < 6 GeV/c. The global uncertainty arises from...

• #### Table 21

Data from Figure 6 (left)

10.17182/hepdata.88291.v1/t21

Nuclear modification factor of Y(3S) at forward and backward $y^{Y}_{CM}$ for pT < 6 GeV/c. The global uncertainty arises from...

• #### Table 22

Data from Figure 6 (right)

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Nuclear modification factor of Y(1S) at forward and backward $y^{Y}_{CM}$ for 6 < pT < 30 GeV/c. The global uncertainty...

• #### Table 23

Data from Figure 6 (right)

10.17182/hepdata.88291.v1/t23

Nuclear modification factor of Y(2S) at forward and backward $y^{Y}_{CM}$ for 6 < pT < 30 GeV/c. The global uncertainty...

• #### Table 24

Data from Figure 6 (right)

10.17182/hepdata.88291.v1/t24

Nuclear modification factor of Y(3S) at forward and backward $y^{Y}_{CM}$ for 6 < pT < 30 GeV/c. The global uncertainty...

• #### Table 25

Data from Figure 7 (left)

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RFB of Y(1S) versus $N^{|\eta_{lab}|<2.4}_{tracks}$.

• #### Table 26

Data from Figure 7 (left)

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RFB of Y(2S) versus $N^{|\eta_{lab}|<2.4}_{tracks}$.

• #### Table 27

Data from Figure 7 (left)

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RFB of Y(3S) versus $N^{|\eta_{lab}|<2.4}_{tracks}$.

• #### Table 28

Data from Figure 7 (right)

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RFB of Y(1S) versus $E^{|\eta_{lab}|>4}_{T}$.

• #### Table 29

Data from Figure 7 (right)

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RFB of Y(2S) versus $E^{|\eta_{lab}|>4}_{T}$.

• #### Table 30

Data from Figure 7 (right)

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RFB of Y(3S) versus $E^{|\eta_{lab}|>4}_{T}$.

• #### Table 31

Data from Figure 8

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Nuclear modification factor of Y(1S), Y(2S), and Y(3S) integrated over pT and $y^{Y}_{CM}$. The global uncertainty arises from the integrated...