Search for ttbar resonances in dilepton+jets final states in pp collisions at 8 TeV

We present a model-independent search for heavy resonances decaying to $\rm{t\bar{t}}$ pairs using 19.7~$\rm{fb^{-1}}$ of data recorded by the CMS detector in $pp$ collisions at $\sqrt{s} = 8$~TeV. The search is based on events containing two leptons (electron or muon) , at least two jets, and large missing transverse energy. No deviation is observed over the expected rate from standard model processes. We set 95\% confidence-level upper limits on the production cross section for heavy resonances decaying to top quark-antiquark pairs in the mass range of 1~TeV -- 3~TeV. Lower mass limits are set for the decays of narrow and wide width leptophobic topcolor Z' bosons, as well as for Kaluza-Klein gluon excitations as predicted in theories beyond the standard model.