Measurement of the inclusive and differential tt production cross sections in lepton + jets final states at 13 TeV

The differential cross section for the production of top quark pairs in proton-proton collisions at 13 TeV is measured as a function of various kinematic variables of the top quarks and the top quark-antiquark system as well as jet multiplicities. This analyis is based on data collected by the CMS experiment at the LHC corresponding to an integrated luminosity of 2.3 fb$^{-1}$. The measurements are performed in the lepton + jets decay channel with an electron or a muon in the final state. The differential cross sections are presented at particle level, within a phase space close to the experimental acceptance, and at parton level in the full phase space. The measured cross sections are compared to several theoretical calculations. No significant deviation from the standard model prediction is observed.