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

The CMS 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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