LHC Higgs Signatures from Extended Electroweak Gauge Symmetry

Abstract

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 three 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 exchanging both spin-1 new gauge bosons and spin-0 Higgs bosons. We identify the lighter Higgs state h with mass 125GeV, 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 125GeV Higgs boson h at the LHC. We demonstrate that the h Higgs boson can naturally have enhanced signals in the diphoton channel $gg\to h\to \gamma \gamma$, while the events rates in the reactions $gg\to h\to W{W}^{\ast }$ and $gg\to h\to Z{Z}^{\ast }$ are generally suppressed relative to the SM expectation. Searching the h Higgs boson via associated productions and vector boson fusions are also discussed for our model. We further analyze the LHC signals of the heavier Higgs boson H as a distinctive 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(8TeV) and LHC(14TeV).

JHEP Journal Version (in Press), 48 pages, 19 Figs, (only minor refinements + extended discussions)

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• Little Higgs theory confronted with the LHC Higgs data
• Extending Higgs Inflation with TeV Scale New Physics
• NLO+NLL limits on W' and Z' gauge boson masses in general extensions of the Standard Model
• Search for single production of the vector-like top partner at the 14 TeV LHC
• $SU(2)\otimes SU(2)$ Gauge Extensions of the MSSM Revisited
• Search for single production of the heavy vectorlike $T$ quark with $T\to th$ and $h\to \gamma \gamma$ at the high-luminosity LHC
• Study of the heavy CP-even Higgs with mass 125 GeV in two-Higgs-doublet models at the LHC and ILC
• Probing a new decay of vector-like top partner mediated by heavy Majorana neutrino via single production
• Does unitarity imply finiteness of electroweak oblique corrections at one-loop? - constraining extra neutral Higgs bosons -