DOIAbstract
State-of-the-art theoretical predictions accurate to next-to-leading order QCD interfaced with Pythia8, Herwig, and Sherpa event generators are tested by comparing the unfolded tt¯ differential data collected with the CMS detector at 8 and 13 TeV. These predictions are also compared with the underlying event activity distributions in tt¯ events using CMS proton-proton data collected at a center of mass energy of 13 TeV. In addition, studies of jet shapes in tt¯ events at 13 TeV are presented. Studies to derive and test the new CMS event tune obtained through jet kinematics in tt¯ events and global event variables are also described
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