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The cross sections for the production of tt-bar bb-bar and tt-bar jj eventsand their ratio sigma[tt-bar bb-bar]/sigma[tt-bar jj] are measured using datacorresponding to an integrated luminosity of 2.3 inverse femtobarns collectedin pp collisions at sqrt(s) = 13 TeV with the CMS detector at the LHC. Eventswith two leptons (e or mu) and at least four reconstructed jets, including atleast two identified as b quark jets, in the final state are selected. In thefull phase space, the measured ratio is 0.022 +/- 0.003 (stat) +/- 0.006(syst), the cross section sigma[tt-bar bb-bar] is 4.0 +/- 0.6 (stat) +/- 1.3(syst) pb and sigma[tt-bar jj] is 184 +/- 6 (stat) +/- 33 (syst) pb. Themeasurements are compared with the standard model expectations obtained from aPOWHEG simulation at next-to-leading-order interfaced with PYTHIA.

physics letters b

Measurements of tt-bar cross sections in association with b jets and  inclusive jets and their ratio using dilepton final states in pp collisions  at sqrt(s) = 13 TeV