Tomohiro Abe, Ning Chen, Hong-Jian He
We study LHC Higgs signatures from the extended electroweak gauge symmetry SU(2) x SU(2) x U(1). Under this gauge structure, we present an effective UV completion of the 3-site moose model with ideal fermion delocalization, which contains two neutral Higgs states (h, H) and two new gauge bosons (W', Z'). We study the unitarity, and reveal that the exact E^2 cancellation in the longitudinal WW scattering amplitudes is achieved by the joint role of the spin-0 Higgs-exchanges and the exchanges of the spin-1 new gauge bosons W'/Z'. We find that the parameter space of this model is highly predictive. We identify the lighter Higgs state h to have mass 125GeV, and derive the predictions for its production and decays signals at the LHC. We demonstrate that the h Higgs boson can naturally have enhanced signals in the diphoton channel $gg \to h \to \gamma\gamma$, but the events rates in the reactions $gg \to h \to WW^*$ and $gg \to h \to ZZ^*$ are generally suppressed relative to the SM expectation. For the parameter region with enhanced $\gamma\gamma$ signals, our model predicts the event rates of WW^* and ZZ^* channels are reduced by a factor of 2-3. We further analyze the production and decays of the heavier Higgs boson H via gluon fusions. For wide mass-ranges of H, we derive constraints from the existing LHC searches, and further study the discovery potential of H at the LHC(8TeV) and LHC(14TeV). The Higgs searches via the vector boson fusion and the associated productions are also discussed.
View original:
http://arxiv.org/abs/1207.4103
No comments:
Post a Comment