CMS collaboration (2231 authors)Hollar, JonathanNayak, ArunaCalpas, BettyBargassa, PedrameBeirão Da Cruz E Silva, CristóvãoFaccioli, PietroFerreira Parracho, Pedro GuilhermeGallinaro, MicheleNguyen, FedericoRodrigues Antunes, JoaoSeixas, JoaoVarela, JoaoVischia, PietroLloret Iglesias, LaraDavid Tinoco Mendes, AndreMusella, PasqualeSilva, PedroPela, JoaoLeonardo, Nuno2019-02-042019-02-042014-08-20http://dx.doi.org/10.1140/epjc/s10052-014-3014-0, 10.1140/epjc/s10052-015-3437-2http://hdl.handle.net/10400.26/26564The normalised differential top quark-antiquark production cross section is measured as a function of the jet multiplicity in proton-proton collisions at a centre-of-mass energy of 7 $\,\text {TeV} $ at the LHC with the CMS detector. The measurement is performed in both the dilepton and lepton+jets decay channels using data corresponding to an integrated luminosity of 5.0 $\,\text {fb}^{-1}$ . Using a procedure to associate jets to decay products of the top quarks, the differential cross section of the $\mathrm {t}\overline{\mathrm {t}}$ production is determined as a function of the additional jet multiplicity in the lepton+jets channel. Furthermore, the fraction of events with no additional jets is measured in the dilepton channel, as a function of the threshold on the jet transverse momentum. The measurements are compared with predictions from perturbative quantum chromodynamics and no significant deviations are observed.engjournal article2019-02-04