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We present the first results on searches for new massive resonances decayingto a top-antitop quark ($t\bar{t}$) pair with the CMS detector at the LHC inproton-proton collisions with a center of mass energy of$\sqrt{s}=13~\mathrm{TeV}$. The data set considered corresponds to anintegrated luminosity of $2.6~\mathrm{fb}^{-1}$ recorded during the the firstyear of the LHC Run-2. Searches are performed by measuring the invariant massdistribution of the $t\bar{t}$ system in semileptonic and fully-hadronic finalstates. Dedicated techniques are used to identify the decay of highly-boostedtop quarks in order to maximize the analyses' sensitivity for $t\bar{t}$resonances with a mass above the TeV scale. No significant excess is observedin the data compared to the expected SM background and exclusion limits are seton the cross section of a $t\bar{t}$ resonance in various new physicsscenarios.

Searches for top-antitop quark resonances at $\sqrt{s}=13~\mathrm{TeV}$ with the CMS detector