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Measurement of the production cross section for Z + b jets in proton-proton collisions at $\sqrt{s}$ = 13 TeV

The collaboration
CMS-SMP-20-015, 2021.

Abstract (data abstract)
The measurements of the cross section of the \PZ boson, decaying to dielectrons or dimuons, in association with at least one bottom quark jet are performed with proton-proton collision data at $\sqrt{s}=$ 13\TeV. The data sample corresponds to an integrated luminosity of 137.1\fbinv, collected by the CMS experiment at the LHC. The integrated cross sections of \PZ~$+\geq$~1~\cPqb~jet\xspace and \PZ~$+\geq$~2~\cPqb~jets\xspace are reported for the electron, muon, and combined channels with full Run 2 data. The measured integrated cross sections are 6.52 $\pm$ 0.04 (stat) $\pm$ 0.40 (syst) $\pm$ 0.14 (theo) pb for \PZ~$+\geq$~1~\cPqb~jet\xspace and 0.65 $\pm$ 0.03 (stat) $\pm$ 0.07 (syst) $\pm$ 0.02 (theo) pb for \PZ~$+\geq$~2~\cPqb~jets\xspace. The differential cross section distributions are measured as a function of various kinematic observables that are useful for precision tests of the perturbative quantum chromodynamics predictions. The ratios of integrated and differential cross sections of \PZ~$+\geq$~2~\cPqb~jets\xspace and \PZ~$+\geq$~1~\cPqb~jet\xspace processes are also determined. The value of the integrated cross section ratio measured in the combined channel is 0.100 $\pm$ 0.005 (stat) $\pm$ 0.007 (syst) $\pm$ 0.003 (theo). All of the measurements are compared with predictions from Monte Carlo simulations.

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Data from Figure 2 (left), located on page 15

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Differential cross section distribution as a function of Z transverse momentum for the Z + >= 1 b jet events

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Data from Figure 2 (right), located on page 15

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Normalized differential cross section distribution as a function of Z transverse momentum for the Z + >= 1 b jet...

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Data from Figure 3 (left), located on page 16

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Differential cross section distribution as a function of the leading b jet transverse momentum for the Z +>= 1 b...

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Data from Figure 3 (right), located on page 16

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Normalized differential cross section distribution as a function of the leading b jet transverse momentum for the Z + >=...

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Data from Figure 4 (left), located on page 16

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Differential cross section distribution as a function of the leading b jet absolute pseudorapidity for the Z + >= 1...

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Data from Figure 4 (right), located on page 16

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Normalized differential cross section distribution as a function of the leading b jet absolute pseudorapidity for the Z + >=...

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Data from Figure 5 (left), located on page 17

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Differential cross section distribution as a function of the leading b jet transverse momentum for Z +>= 1 b jet...

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Data from Figure 5 (right), located on page 17

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Normalized differential cross section distribution as a function of azimuthal difference between Z boson and the leading b jet for...

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Data from Figure 6 (left), located on page 18

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Differential cross section distribution as a function of the rapidity difference between Z boson and the leading b jet for...

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Data from Figure 6 (right), located on page 18

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Normalized differential cross section distribution as a function of the rapidity difference between Z boson and the leading b jet...

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Data from Figure 7 (left), located on page 19

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Differential cross section distribution as a function of the angular separation between the Z boson and the leading b jet...

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Data from Figure 7 (right), located on page 19

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Normalized differential cross section distribution as a function of the angular separation between the Z boson and the leading b...

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Data from Figure 8 (left), located on page 19

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Differential cross section distribution as a function of the leading b jet transverse momentum for the Z + >= 2...

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Data from Figure 8 (right), located on page 19

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Normalized differential cross section distribution as a function of the leading b jet transverse momentum for the Z + >=...

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Data from Figure 9 (left), located on page 20

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Differential cross section distribution as a function of the leading b jet absolute pseudorapidity

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Data from Figure 9 (right), located on page 20

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Normalized differential cross section distribution as a function of the leading b jet absolute pseudorapidity

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Data from Figure 10 (left), located on page 20

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Differential cross section distribution as a function of the subleading b jet transverse momentum for the Z + >= 2...

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Data from Figure 10 (right), located on page 20

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Normalized differential cross section distribution as a function of the subleading b jet transverse momentum for the Z + >=...

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Data from Figure 11 (left), located on page 21

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Differential cross section distribution as a function of the Z boson transverse momentum for the Z + >= 2 b...

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Data from Figure 11 (right), located on page 21

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Normalized differential cross section distribution as a function of the Z boson transverse momentum for the Z + >= 2...

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Data from Figure 12 (left), located on page 21

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Differential cross section as a function of the angular separation between two b jets for the Z + >= 2...

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Data from Figure 12 (right), located on page 21

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Normalized differential cross section as a function of the angular separtion between two b jets for the Z + >=...

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Data from Figure 13 (left), located on page 22

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Differential cross section as a function of the minimum angular separation between the Z boson and two b jets for...

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Data from Figure 13 (right), located on page 22

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Normalized differential cross section as a function of the minimum angular separation between the Z boson and two b jets...

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Data from Figure 14 (left), located on page 22

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Differential cross section as a function of the asymmetry of the Z + >= 2 b jets system

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Data from Figure 14 (right), located on page 22

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Normalized differential cross section as a function of the asymmetry of the Z + >= 2 b jets system

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Data from Figure 15 (left), located on page 23

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Differential cross section as a function of the invariant mass of two b jets for the Z + >= 2...

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Data from Figure 15 (right), located on page 23

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Normalized differential cross section as a function of the invariant mass of two b jets for the Z + >=...

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Data from Figure 16 (left), located on page 23

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Differential cross section as a function of the invariant mass of the Z boson and two b jets for the...

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Data from Figure 16 (right), located on page 23

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Normalized differential cross section as a function of invariant mass of the Z boson and two b jets for the...

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Data from Figure 17 (left), located on page 24

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Distributions of the cross section ratios as a function of the leading b jet transverse momentum

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Data from Figure 17 (right), located on page 24

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Distributions of the cross section ratios as a function of the leading b jet absolute pseudorapidity