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

The CMS collaboration
Phys.Lett.B, 2016

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.

Loading Data...