Jet multiplicity distributions in top quark pair (tˉt) events are measured in pp collisions at a centre-of-mass energy of 8\;\text{TeV} with the CMS detector at the LHC, using a data set corresponding to an integrated luminosity of 19.7/fb. The measurement is performed in the dilepton decay channels e+e−, μ+μ−, and e±μ∓). The absolute and normalized differential cross-sections for tˉt production are measured as a function of jet multiplicity for different jet transverse momentum thresholds and the kinematic properties of the leading additional jets. The differential tˉtb and tˉtbˉb cross-sections are presented for the first time as a function of the kinematic properties of the leading additional b-jets. Furthermore, the fraction of events without additional jets above a threshold is measured as a function of the transverse momenta of the leading additional jets and the scalar sum of the transverse momenta of all additional jets.
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