Measurements of $\mathrm{t}\overline{\mathrm{t}}$ cross sections in association with b jets and inclusive jets and their ratio using dilepton final states in pp collisions at $\sqrt{s}=13\text{TeV}$

The cross sections for the production of $\mathrm{t}\overline{\mathrm{t}}\mathrm{b}\overline{\mathrm{b}}$ and $\mathrm{t}\overline{\mathrm{t}}\mathrm{jj}$ events and their ratio ${\sigma }_{\mathrm{t}\overline{\mathrm{t}}\mathrm{b}\overline{\mathrm{b}}}/{\sigma }_{\mathrm{t}\overline{\mathrm{t}}\mathrm{jj}}$ are measured using data corresponding to an integrated luminosity of 2.3 fb⁻¹collected in pp collisions at $\sqrt{s}=13\text{TeV}$ with the CMS detector at the LHC. Events with two leptons (e or μ) and at least four reconstructed jets, including at least two identified as b quark jets, in the final state are selected. In the full phase space, the measured ratio is $0.022\pm 0.003\text{(stat)}\pm 0.006\text{(syst)}$, the cross section ${\sigma }_{\mathrm{t}\overline{\mathrm{t}}\mathrm{b}\overline{\mathrm{b}}}$ is $4.0\pm 0.6\text{(stat)}\pm 1.3\text{(syst)}\text{pb}$ and ${\sigma }_{\mathrm{t}\overline{\mathrm{t}}\mathrm{jj}}$ is $184\pm 6\text{(stat)}\pm 33\text{(syst)}\text{pb}$. The measurements are compared with the standard model expectations obtained from a powheg simulation at next-to-leading-order interfaced with pythia.