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

The 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

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Figure 4 left

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

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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

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Figure 5 left

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

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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|

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Figure 6 left

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

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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

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Figure 7 left

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

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Figure 7 right

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

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Figure 8 left

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

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Figure 8 right

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

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Figure 9

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

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Figure 10

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

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Figure 11

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

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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,...

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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

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Figure 14

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

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Figure 15

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

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Figure 16

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

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Figure 17

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

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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