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Compact Muon Solenoid
LHC, CERN

CMS-PAS-SMP-20-015
Measurement of Z+b jets cross section in proton-proton collisions at s= 13 TeV
Abstract: The measurements of the cross section of the Z boson, decaying to dielectrons or dimuons, in association with at least one bottom quark jet are performed with proton-proton collision data at s= 13 TeV. The data sample corresponds to an integrated luminosity of 137.1 fb1, collected by the CMS experiment at the LHC. The integrated cross sections of Z + 1 b jet and Z + 2 b jets are reported for the electron, muon, and combined channels with full Run 2 data. The measured integrated cross sections are 6.52 ± 0.04 (stat) ± 0.40 (syst) ± 0.14 (theo) pb for Z + 1 b jet and 0.65 ± 0.03 (stat) ± 0.07 (syst) ± 0.02 (theo) pb for Z + 2 b jets. 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 Z + 2 b jets and Z + 1 b jet processes are also determined. The value of the integrated cross section ratio measured in the combined channel is 0.100 ± 0.005 (stat) ± 0.007 (syst) ± 0.003 (theo). All of the measurements are compared with predictions from Monte Carlo simulations.
CMS Publications
Compact Muon Solenoid
LHC, CERN