New W-prime signals at the LHC

Abstract

We study the $W^{{}^{\prime }}$ phenomenology in composite Higgs/ warped extra dimensional models focusing on the effect of fermionic resonances at $\sim$1 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 vector-like 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, $m_{W^{{}^{\prime }}}\gtrsim 2$ TeV, and of the $W^{{}^{\prime }}\to Tb$ mode, that 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.

Comments: 25 pp. v2: minor changes, references added, version to appear in Phys. Rev. D