Optimization of Methods for Selecting Events with Muon Pairs and Simulation of Backgrounds

The physics program of the CMS experiment is aimed at testing the Standard Model on the new energy scale of the order of TeV and at searching for new physical objects and phenomena beyond the Standard Model. At present, in the dilepton channels, where the search for new physics is going on, the established limits on the invariant masses of dileptons reach a few TeV. At high energies, one of the problems in the search for new heavy Z' resonances is the presence of background processes, e.g., the production of WZ and ZZ dibosons, in which muons are produced. The dimuons formed from these muons can be misinterpreted as candidates for heavy resonances, which makes the problem of the background elimination even more topical. To this end, the analyses for isolating and reducing the backgrounds were performed in this work.