P o S ( L H C P 2 0 1 8 ) 2 4 0 Top quark pair production cross sections at CMS

A summary of the latest results on inclusive and differential tt̄ cross sections by CMS is presented. Several new differential cross section measurements have been performed by CMS using an amount of 35.9 fb−1 of data collected in 2016. The studies include differential cross section measurements as a function of the tt̄ system, the top quarks, its decay products and global event variables. Double-differential cross sections are also explored. Investigations on the jet substructure in tt̄ events are also presented. Finally, the first measurement of the underlying event in tt̄ events is summarized. All these new measurements provide excellent information about the agreement between the observations and different generators and theoretical parametrizations used in tt̄ modeling.