Measurements of the associated production of a Z boson and b jets in pp collisions at sqrt(s) = 8 TeV

The CMS collaboration
Eur.Phys.J.C 77 (2017) 751, 2017.

Abstract (data abstract)
CERN-LHC. Measurements of the associated production of a Z boson with at least one jet originating from a b quark in proton-proton collisions at s= 8 TeV are presented. Differential cross sections are measured with data collected by the CMS experiment corresponding to an integrated luminosity of 19.8 fb**1. Z bosons are reconstructed through their decays to electrons and muons. Cross sections are measured as a function of observables characterizing the kinematics of the b jet and the Z boson. Ratios of differential cross sections for the associated production with at least one b jet to the associated production with any jet are also presented. The production of a Z boson with two b jets is investigated, and differential cross sections are measured for the dijet system. Results are compared to theoretical predictions, testing two different flavour schemes for the choice of initial-state partons. The fiducial region is defined as: - 2e or 2mu - ptLepton > 20 GeV - |etaLepton| < 2.4 - mll must be between 71 and 111 GeV - at least one jet anti-kt(DR=0.5) with ptJet > 30 GeV and |etaJet| < 2.4 - DeltaR(l,jet) > 0.5 - for Z+>=1b (indicated as Z(1b)): at least one selected jet b-tagged; for Z+>=2b (indicated as Z(2b)): at least two selected jets b-tagged

  • Table 1

    Figure 4 left

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    Differential fiducial cross section for Z(1b) production as a function of the leading b jet pT

  • Table 2

    Figure 4 right

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    Cross section ratio for Z(1b) and Z+jets production as a function of the leading b/inclusive (j) jet pT

  • Table 3

    Figure 5 left

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    Differential fiducial cross section for Z(1b) production as a function of the leading b jet |eta|

  • Table 4

    Figure 5 right

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    cross section ratio for Z(1b) and Z+jets production as a function of the leading b/inclusive (j) jet |eta|

  • Table 5

    Figure 6 left

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    Differential fiducial cross section for Z(1b) production as a function of the Z boson pT

  • Table 6

    Figure 6 right

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    cross section ratio for Z(1b) and Z+jets production as a function of the Z boson pT

  • Table 7

    Figure 7 left

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    Differential fiducial cross section for Z(1b) production as a function of HT

  • Table 8

    Figure 7 right

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    cross section ratio for Z(1b) and Z+jets production as a function of HT

  • Table 9

    Figure 8 left

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    Differential fiducial cross section for Z(1b) production as a function of DeltaPhi(Zb)

  • Table 10

    Figure 8 right

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    cross section ratio for Z(1b) and Z+jets production as a function of DeltaPhi(Zb)

  • Table 11

    Figure 9

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    Differential fiducial cross section for Z(2b) production as a function of the leading b jet pT

  • Table 12

    Figure 10

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    Differential fiducial cross section for Z(2b) production as a function of the subleading b jet pT

  • Table 13

    Figure 11

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    Differential fiducial cross section for Z(2b) production as a function of the Z boson pT

  • Table 14

    Figure 12

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    Differential fiducial cross section for Z(2b) production as a function of the invari- ant mass of the b jet pair,...

  • Table 15

    Figure 13

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    Differential fiducial cross section for Z(2b) production as a function of the invari- ant mass of the Zbb system, MZbb

  • Table 16

    Figure 14

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    Differential fiducial cross section for Z(2b) production as a function of DeltaPhi(bb)

  • Table 17

    Figure 15

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    Differential fiducial cross section for Z(2b) production as a function of DeltaR(bb)

  • Table 18

    Figure 16

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    Differential fiducial cross section for Z(2b) production as a function of minimum DeltaR(Zb)

  • Table 19

    Figure 17

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    Differential fiducial cross section for Z(2b) production as a function of AZbb

  • Table 20

    Section 8.3

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    fiducial cross section, for a single lepton type, for the production of Z(1b) and Z(2b) events

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