# LHC Higgs signatures from extended electroweak gauge symmetry

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## Abstract

We study LHC Higgs signatures from the extended electroweak gauge symmetry SU(2) ⊗ SU(2) ⊗ 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*) plus three new gauge bosons (*W* ^{′} *, Z* ^{′}). We study the unitarity, and reveal that the exact *E* ^{2} cancellation in the longitudinal *V* _{L} *V* _{L} scattering amplitudes is achieved by the joint role of exchanging both spin-1 new gauge bosons *W* ^{′} */Z* ^{′} and spin-0 Higgs bosons *h/H*. We identify the lighter Higgs state *h* with mass 125 GeV, and derive the unitarity bound on the mass of heavier Higgs boson *H*. The parameter space of this model is highly predictive. We study the production and decay signals of this 125 GeV Higgs boson *h* at the LHC. We demonstrate that the *h* Higgs boson can naturally have enhanced signals in the diphoton channel *gg* → *h* → γγ, while the event rates in the reactions *gg* → *h* → *W W* ^{∗} and *gg* → *h* → *ZZ* ^{∗} are generally suppressed relative to the SM expectation. Searching the *h* Higgs boson via the associated production and the vector boson fusions are also discussed for our model. We further analyze the LHC signals of the heavier Higgs boson *H* as a new physics discriminator from the SM. For wide mass-ranges of *H*, we derive constraints from the existing LHC searches, and study the discovery potential of *H* at the LHC (8 TeV) and LHC (14 TeV).

## Keywords

Higgs Physics Beyond Standard Model## References

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