Measurement of particle level differential ttbar cross sections in the dilepton channel at sqrt(s) = 13 TeV

Normalised differential cross sections for top quark pair production are measured in the dilepton ($e^{+}e^{-}$, $\mu^{+}\mu^{-}$, and $\mu^{\mp}e^{\pm}$) decay channel in proton-proton collisions at a center-of-mass energy of 13\:TeV. The measurements are performed with data corresponding to an integrated luminosity of $2.2\:\mathrm{fb^{-1}}$ collected in 2015 using the CMS detector at the LHC. The cross section is measured differentially as a function of the kinematic properties of the leptons, \cPqb~jets, top quarks, and top quark pairs at particle level. The results are compared to several models of perturbative QCD and found to be in agreement with the standard model predictions.