Measurement of differential top quark pair production cross sections in a fiducial volume as a function of event variables in pp collisions at $\sqrt{s} = 13$ TeV

A measurement of the normalised differential cross sections for top quark pair production with respect to a number of event-level observables is presented. Approximately 71 pb$^{-1}$ of data collected using the CMS detector at the LHC in 2015 at a centre-of-mass energy of $\sqrt{s} = 13$ TeV are used. The analysis is performed in the lepton plus jets channels, where the lepton is either an electron or a muon. Unfolding is performed such that the results can be compared with theoretical predictions at particle level in a fiducial phase space volume. The results are compared with predictions from different Monte Carlo event generators, which are all able to describe the data within their large statisical uncertainties.