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Study of Z production in PbPb and pp collisions at $ \sqrt{s_{\mathrm{NN}}}=2.76 $ TeV in the dimuon and dielectron decay channels

The CMS collaboration
JHEP 1503 (2015) 022, 2015

Abstract (data abstract)
CERN-LHC. The production of Z bosons is studied in the dimuon and dielectron decay channels in PbPb and pp collisions at $\sqrt{s_{\mathrm{NN}}}$ = 2.76 TeV, using data collected by the CMS experiment at the LHC. The PbPb data sample corresponds to an integrated luminosity of about $150~\mu\mathrm{b}^{-1}$, while the pp data sample collected in 2013 at the same nucleon-nucleon centre-of-mass energy has an integrated luminosity of $5.4~\mathrm{pb}^{-1}$. The Z boson yield is measured as a function of rapidity, transverse momentum, and collision centrality. The ratio of PbPb to pp yields, scaled by the number of inelastic nucleon-nucleon collisions, is found to be $1.06\pm0.05~\mathrm{(stat)}\pm0.08~\mathrm{(syst)}$ in the dimuon channel and $1.02\pm0.08~\mathrm{(stat)}\pm0.15~\mathrm{(syst)}$ in the dielectron channel, for centrality-integrated Z boson production. This binary collision scaling is seen to hold in the entire kinematic region studied, as expected for a colourless probe that is unaffected by the hot and dense QCD medium produced in heavy ion collisions.

  • Table 1

    Data from Figure 2 TOP LEFT

    10.17182/hepdata.66612.v1/t1

    The measured Z boson production cross section in pp collisions as a function of the Z boson pT for the...

  • Table 2

    Data from Figure 2 TOP RIGHT

    10.17182/hepdata.66612.v1/t2

    The measured Z boson production cross section in pp collisions as a function of the Z boson pT for the...

  • Table 3

    Data from Figure 2 BOTTOM LEFT

    10.17182/hepdata.66612.v1/t3

    The measured Z boson production cross section in pp collisions as a function of the Z boson rapidity for the...

  • Table 4

    Data from Figure 2 BOTTOM RIGHT

    10.17182/hepdata.66612.v1/t4

    The measured Z boson production cross section in pp collisions as a function of the Z boson rapidity for the...

  • Table 5

    Data from Figure 3 LEFT

    10.17182/hepdata.66612.v1/t5

    Event centrality dependence of the $\mbox{Z}\rightarrow\mu^{+}\mu^{-}$ yields per MB event in PbPb collisions, divided by the expected average nuclear overlap...

  • Table 6

    Data from Figure 3 RIGHT

    10.17182/hepdata.66612.v1/t6

    Event centrality dependence of the $\mbox{Z}\rightarrow e^{+}e^{-}$ yields per MB event in PbPb collisions, divided by the expected average nuclear...

  • Table 7

    Data from Figure 4 TOP LEFT

    10.17182/hepdata.66612.v1/t7

    The measured Z boson yields per MB event in PbPb collisions as a function of the Z boson $p_{\rm T}$...

  • Table 8

    Data from Figure 4 TOP RIGHT

    10.17182/hepdata.66612.v1/t8

    The measured Z boson yields per MB event in PbPb collisions as a function of the Z boson $p_{\rm T}$...

  • Table 9

    Data from Figure 4 BOTTOM LEFT

    10.17182/hepdata.66612.v1/t9

    The measured Z boson yields per MB event in PbPb collisions as a function of the Z boson rapidity for...

  • Table 10

    Data from Figure 4 BOTTOM LEFT

    10.17182/hepdata.66612.v1/t10

    The measured Z boson yields per MB event in PbPb collisions as a function of the Z boson rapidity for...

  • Table 11

    Data from Figure 6 TOP LEFT

    10.17182/hepdata.66612.v1/t11

    The measured Z boson yields per MB event in PbPb collisions as a function of the Z boson rapidity for...

  • Table 12

    Data from Figure 6 TOP RIGHT

    10.17182/hepdata.66612.v1/t12

    The measured Z boson yields per MB event in PbPb collisions as a function of the Z boson $p_{\rm T}$...

  • Table 13

    Data from Figure 6 BOTTOM

    10.17182/hepdata.66612.v1/t13

    Event centrality dependence of the $\mbox{Z}\rightarrow l^{+}l^{-}$ yields per MB event in PbPb collisions, divided by the expected average nuclear...

  • Table 14

    Data from Figure 7 LEFT

    10.17182/hepdata.66612.v1/t14

    The measured Z boson production cross section in pp collisions as a function of the Z boson rapidity for the...

  • Table 15

    Data from Figure 2 TOP RIGHT

    10.17182/hepdata.66612.v1/t15

    The measured Z boson production cross section in pp collisions as a function of the Z boson pT for the...

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