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Differential cross section measurements of the associated production of topquark and b quark pairs, $\text{t}\bar{\text{t}}\text{b}\bar{\text{b}}$, arepresented. The results are based on data from proton-proton collisionscollected by the CMS detector at the LHC at a centre-of-mass energy of$\sqrt{s} = 13\text{ TeV}$, corresponding to an integrated luminosity of $138\text{ fb}^{-1}$. Four fiducial phase space regions are defined targetingdistinct aspects of the $\text{t}\bar{\text{t}}\text{b}\bar{\text{b}}$ process.Kinematic variables are defined at the stable particle level and distributionsare unfolded to the particle level through maximum likelihood fits. The crosssections are measured in the lepton+jets decay channel of the top quark pair,using events with exactly one isolated electron or muon and at least five jets.The results are compared with predictions from several event generators. Thedifferential measurements have relative uncertainties in the range of$2\!-\!50\%$, depending on the phase space and the observable.

Inclusive and differential cross section measurements of  $\text{t}\bar{\text{t}}\text{b}\bar{\text{b}}$ production in the lepton+jets  channel at $\sqrt{s} = 13\text{ TeV}$