W′production at the LHC in the four-site Higgsless model

Abstract

We study the phenomenology of the four-site Higgsless model, based on the $SU(2{)}_{L}\ifmmode\times\else\texttimes\fi{}SU(2{)}_{1}\ifmmode\times\else\texttimes\fi{}SU(2{)}_{2}\ifmmode\times\else\texttimes\fi{}U(1{)}_{Y}$ gauge symmetry, at present colliders. The model predicts the existence of two neutral and four charged extra gauge bosons, ${Z}_{1,2}$ and ${W}_{1,2}^{\ifmmode\pm\else\textpm\fi{}}$. In this paper, we focus on the charged gauge sector. We first derive limits on ${W}_{1,2}$-boson masses and couplings to SM fermions from direct searches at the Tevatron. We then estimate at the 7 TeV LHC the exclusion limits with the actual $L=1\text{ }\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$ and the discovery potential with the expected $L=10\text{ }\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$. In contrast to the minimal (or three-site) Higgsless model which predicts almost fermiophobic extra gauge bosons, the next-to-minimal (or four-site) Higgsless model recovers sizable ${W}_{1,2}$-boson couplings to ordinary matter, expressing the nonfermiophobic multiresonance inner nature of extra-dimensional theories. Owing to this feature, we find that in one year from now the new heavy gauge bosons, ${W}_{1,2}^{\ifmmode\pm\else\textpm\fi{}}$, could be discovered in the final state with an electron and large missing transverse energy at the 7 TeV LHC for ${W}_{1,2}$-boson masses in the TeV region, depending on model parameters.