Search for new resonances with top quark

Many models of physics beyond the Standard Model predict new gauge bosons that decay to a top quark pair or a top quark and a bottom quark. The most recent results from new resonance searches for $\rm{Z'} \rightarrow \rm{t\bar{t}} \rightarrow \rm{W^{+}bW^{-}\bar{b}}$ and $\rm{W'} \rightarrow \rm{tb} \rightarrow \rm{Wbb}$ are presented using the proton-proton collision data at a centre-of-mass energy of 8 TeV. The searches are performed with the ATLAS and CMS experiments at the LHC using an integrated luminosity of 20.3 fb$^{-1}$ and 19.7 fb$^{-1}$, respectively. The analyses are done in the leptonic and hadronic decay modes of the top quark. No evidence for new resonances with top quark is observed and 95\% confidence level (CL) limits on the production rate are determined for massive states in theories beyond the Standard Model.