Explore the intricacies of top quark pair production at the LHC in this 36-minute lecture from the Galileo Galilei Institute. Delve into the study of additional jet activity, beginning with an introduction and motivation for the research. Examine the experimental progress made in this field and the theoretical challenges faced by researchers. Gain insights into the current theoretical status and analyze phenomenological results, including differential cross-section comparisons and new predictions. Conclude with a comprehensive summary, detailed explanations, and expert comments on the subject matter, enhancing your understanding of this advanced topic in particle physics.