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Measurements of normalized differential cross sections for top quark pairproduction are performed in the dilepton decay channels in proton-protoncollisions at a center-of-mass energy of 13 TeV. The differential crosssections are measured with data corresponding to an integrated luminosity of2.1 fb$^{-1}$ recorded by the CMS experiment at the LHC. We have measured thecross sections differentially as a function of the kinematic properties of theleptons (electron or muon), jets from bottom quark hadronization, top quarks,and top quark pairs at the particle and parton levels. The $t\bar{t}$differential cross section measurements are compared to several Monte Carlogenerators that implement calculations up to next-to-leading order inperturbative quantum chromodynamics interfaced with parton showering, and alsoto fixed-order theoretical calculations of top quark pair production beyondnext-to-leading order accuracy.

Measurement of normalized differential $t\bar{t}$ cross sections in the dilepton channel in pp collisions at center-of-mass energy of 13 TeV