Search for Z' decaying to ttbar in the dilepton+jets final states with the CMS detector at √s = 8tev
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A model-independent search for heavy resonances decaying to top-antitop pairs using 19.7 fb -1 of data recorded by the CMS detector in pp collisions at 8 TeV center of mass energy is presented. The search is based on events containing two leptons (electron or muon) and at least two jets. No deviation is observed over the expected rate from the Standard Model processes. Therefore, 95% confidence-level upper limits are set on the production cross section times branching fraction for the heavy resonances decaying to top-antitop in the mass range of 1-3 TeV. Upper mass limits are set for the narrow and wide width leptophobic top color Z', as well as for the Kaluza-Klein excitation of gluons as predicted in theories beyond the Standard Model.