Analysis of heavy quark production processes in proton collisions at the energy of 13 TeV

The results of experiments at the Large Hadron Collider gave clear confirmation of the modern Standard Model (SM) of fundamental interactions, but at the same time they raised the challenge of expanding this model to solve its existing problems. One of the demonstrations of the SM expansion models is new massive carriers of interactions, which can be detected in the form of resonances. Particular attention is paid to the search for resonances that are born accompanied by heavy quarks and decay into heavy quarks. To analyze such processes, we consider systems consisting of two t and two b quarks, formed in pp collisions at an energy of 13 TeV, where a maximum cumulative luminosity of 140 fb-1 has been accumulated. The work presents models of interactions that include the birth and decay of such resonances. Methods for their identification and categories of events in which pairs of heavy quarks are present, effective event analysis variables, and the relationship of these variables with resonance parameters are considered. The role of Monte Carlo modeling of SM processes and the birth of new resonances for describing the characteristics of measured interactions is shown. The results of a joint description of the characteristics of such interactions and preliminary estimates of the probability of the presence of new massive resonances in systems of several heavy SM quarks are presented.