Phenomenology of an SU (2)1×SU (2)2×U (1)Y model at the LHC

We investigate the implications of a minimal SU(2) gauge symmetry extension of the standard model at the LHC. To achieve the spontaneous symmetry breaking, a heavy Higgs doublet of the SU(2) is introduced. To obtain an anomaly-free model and the decays of new charged gauge bosons, we include a vectorlike quark doublet. We also employ a real scalar boson to dictate the heavy Higgs production via the gluon-gluon fusion processes. We find that the new gauge coupling and the masses of new gauge bosons can be strictly bounded by the electroweak ρ-parameter and dilepton resonance experiments at the LHC. We find that due to the new charged gauge boson enhancement, the cross sections for a heavy scalar boson to diphoton channel measured by ATLAS and CMS can be easily satisfied when the values of Yukawa couplings are properly taken. Furthermore, by adopting event simulation, we find that the significance of pp→(γγ)H+jet, where the diphoton is from the heavy Higgs decay, can be over 4σ when the luminosity is above 60 fb-1.