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Suppression of $\Upsilon(1S), \Upsilon(2S)$ and $\Upsilon(3S)$ production in PbPb collisions at $\sqrt{s_{\rm NN}}$ = 2.76 TeV

The collaboration
Phys.Lett.B 770 (2017) 357-379, 2017.

Abstract (data abstract)
CERN-LHC. The production yields of $\Upsilon (1S)$, $\Upsilon (2S)$, and $\Upsilon (3S)$ quarkonium states are measured through their decays into muon pairs in the CMS detector, in PbPb and pp collisions at the centre-of-mass energy per nucleon pair of 2.76 TeV. The data correspond to integrated luminosities of 166 μb−1 and 5.4 pb−1 for PbPb and pp collisions, respectively. Differential production cross sections are reported as functions of $\Upsilon$ rapidity y up to 2.4, and transverse momentum pT up to 20 GeV/c. A strong centrality-dependent suppression is observed in PbPb relative to pp collisions, by factors of up to $\approx 2$ and 8, for the $\Upsilon (1S)$ and $\Upsilon (2S)$ states, respectively. No significant dependence of this suppression is observed as a function of y or pT. The $\Upsilon (3S)$ state is not observed in PbPb collisions, which corresponds to a suppression for the centrality-integrated data by at least a factor of $\approx 7$ at a 95% confidence level. The observed suppression is in agreement with theoretical scenarios modeling the sequential melting of quarkonium states in a quark gluon plasma.

• #### Table 1

Data from Figure 2 left

10.17182/hepdata.77220.v2/t1

Differential cross section for Y(1S) states as a function of their transverse momentum and per unit of rapidity in pp...

• #### Table 2

Data from Figure 2 left

10.17182/hepdata.77220.v2/t2

Differential cross section for Y(2S) states as a function of their transverse momentum and per unit of rapidity in pp...

• #### Table 3

Data from Figure 2 left

10.17182/hepdata.77220.v2/t3

Differential cross section for Y(3S) states as a function of their transverse momentum and per unit of rapidity in pp...

• #### Table 4

Data from Figure 2 right

10.17182/hepdata.77220.v2/t4

Differential cross section for Y(1S) states as a function of their transverse momentum and per unit of rapidity in PbPb...

• #### Table 5

Data from Figure 2 right

10.17182/hepdata.77220.v2/t5

Differential cross section for Y(2S) states as a function of their transverse momentum and per unit of rapidity in PbPb...

• #### Table 6

Data from Figure 3 left

10.17182/hepdata.77220.v2/t6

Differential cross section for Y(1S) states as a function of their rapidity and integrated over transverse momentum in pp collisions....

• #### Table 7

Data from Figure 3 left

10.17182/hepdata.77220.v2/t7

Differential cross section for Y(2S) states as a function of their rapidity and integrated over transverse momentum in pp collisions....

• #### Table 8

Data from Figure 3 left

10.17182/hepdata.77220.v2/t8

Differential cross section for Y(3S) states as a function of their rapidity and integrated over transverse momentum in pp collisions....

• #### Table 9

Data from Figure 3 right

10.17182/hepdata.77220.v2/t9

Differential cross section for Y(1S) states as a function of their rapidity and integrated over transverse momentum in PbPb collisions....

• #### Table 10

Data from Figure 3 right

10.17182/hepdata.77220.v2/t10

Differential cross section for Y(2S) states as a function of their rapidity and integrated over transverse momentum in PbPb collisions....

• #### Table 11

Data from Figure 4 left

10.17182/hepdata.77220.v2/t11

Nuclear modification factor for Υ(1S) states in PbPb collisions as a function of pT. Statistical (systematic) uncertainties are displayed as...

• #### Table 12

Data from Figure 4 left

10.17182/hepdata.77220.v2/t12

Nuclear modification factor for Υ(2S) states in PbPb collisions as a function of pT. Statistical (systematic) uncertainties are displayed as...

• #### Table 13

Data from Figure 4 right

10.17182/hepdata.77220.v2/t13

Nuclear modification factor for Υ(1S) states in PbPb collisions as a function of |y|. Statistical (systematic) uncertainties are displayed as...

• #### Table 14

Data from Figure 4 right

10.17182/hepdata.77220.v2/t14

Nuclear modification factor for Υ(2S) states in PbPb collisions as a function of |y|. Statistical (systematic) uncertainties are displayed as...

• #### Table 15

Data from Figure 5

10.17182/hepdata.77220.v2/t15

Nuclear modification factors for Υ(1S) meson production in PbPb collisions, as a function of centrality, displayed as the average number...

• #### Table 16

Data from Figure 5

10.17182/hepdata.77220.v2/t16

Nuclear modification factors for Υ(2S) meson production in PbPb collisions, as a function of centrality, displayed as the average number...

• #### Table 17

Data from Figure 5

10.17182/hepdata.77220.v2/t17

Nuclear modification factors for Υ(1S), Υ(2S) and Υ(3S) meson production in PbPb collisions, integrated over centrality. For the Υ(3S), the...

Version 2 modifications: Fix affecting Tab 15 & 16: Npart values were inverted w.r.t. RAA in v1. v2 has correct order.