Abstract
The 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.Electronic supplementary materialThe online version of this article (doi:10.1140/epjc/s10052-015-3709-x) contains supplementary material, which is available to authorized users.
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