Chatrchyan, S.Chatrchyan, S.Khachatryan, V.Sirunyan, A. M.Tumasyan, A.Adam, W.The CMS Collaboration2025-03-072025-03-0720141434-60441434-6052https://doi.org/10.1140/epjc/s10052-014-3014-0https://hdl.handle.net/20.500.12507/2834The 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 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 fb(-1). Using a procedure to associate jets to decay products of the top quarks, the differential cross section of the t (t) over bar 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.eninfo:eu-repo/semantics/openAccessArticle748WOS:0003408240000012-s2.0-8490827795910.1140/epjc/s10052-014-3014-0Q1Q1