CMS collaboration (2139 authors)Hollar, JonathanNayak, ArunaBargassa, PedrameBeirão Da Cruz E Silva, CristóvãoFaccioli, PietroFerreira Parracho, Pedro GuilhermeGallinaro, MicheleLloret Iglesias, LaraNguyen, FedericoRodrigues Antunes, JoaoSeixas, JoaoVarela, JoaoVischia, PietroDavid Tinoco Mendes, AndreMusella, PasqualeSilva, PedroPela, JoaoLeonardo, Nuno2019-02-042019-02-042015-11-20http://dx.doi.org/10.1140/epjc/s10052-015-3709-xhttp://hdl.handle.net/10400.26/26839The normalized differential cross section for top quark pair ( ${\mathrm{t}}\overline{{\mathrm{t}}}$ ) production is measured in pp collisions at a centre-of-mass energy of 8 $\,\text {TeV}$ at the CERN LHC using the CMS detector in data corresponding to an integrated luminosity of 19.7 $\,\text {fb}^{-1}$ . The measurements are performed in the lepton $+$ jets ( $\mathrm {e}/\mu $ $+$ jets) and in the dilepton ( $\mathrm {e}^+\mathrm {e}^-$ , $\mu ^+ \mu ^- $ , and $\mathrm {e}^\pm \mu ^{\mp }$ ) decay channels. The ${\mathrm{t}}\overline{{\mathrm{t}}}$ cross section is measured as a function of the kinematic properties of the charged leptons, the jets associated to b quarks, the top quarks, and the ${\mathrm{t}}\overline{{\mathrm{t}}}$ system. The data are compared with several predictions from perturbative quantum chromodynamic up to approximate next-to-next-to-leading-order precision. No significant deviations are observed relative to the standard model predictions.engjournal article2019-02-04