Search for Z' resonances decaying into top-antitop pairs in fully leptonic final state at CMS

We present a search for narrow-width resonances (Z') decaying to top-antitop pairs using 4.6 /fb of data recorded by the CMS detector at the LHC in proton-proton collisions at $\sqrt{s}$ = 7 TeV. No significant deviation from Standard Model prediction is observed. We, therefore, set 95\% confidence-level upper limits on the production cross section of the narrow-width resonance times its branching fraction to top-antitop for different resonance masses.