We study the $W^{\prime }$ phenomenology in composite Higgs/Warped extra-dimensional models focusing on the effect of fermionic resonances at $\sim 1\mathrm{TeV}$. After deriving the existing bounds from the current LHC-8 analyses, we highlight the most promising signatures for $W^{\prime }$ discovery at the 14 TeV LHC. We find in particular very promising the study of $W^{\prime }$ decay modes into vectorlike top partners, specifically the decay into a doublet of custodian heavy fermions, $T_{5/3}{T}_{2/3}$, and the decay into a heavy fermion plus a Standard Model quark. We perform a detailed parton-level analysis of the channel $W^{\prime }\to T_{5/3}{T}_{2/3}$ in the same-sign dilepton final state, finding that it is a very promising signature to test the region at high $W^{\prime }$ mass, $m_{W^{\prime }}\gtrsim 2\mathrm{TeV}$, and of the $W^{\prime }\to Tb$ mode, which is one of the best channels to test the intermediate $W^{\prime }$ mass region and that, already with the LHC-8 data, could extend the present exclusion bounds.

• Received 29 April 2014

DOI:https://doi.org/10.1103/PhysRevD.89.095027