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Motivated by the excess in the diphoton production rate of the Higgs boson atthe Large Hadron Collider (LHC), we investigate the possibility that one of theCP-even Higgs bosons of the extra U(1) extended minimal supersymmetric standardmodel can give a consistent result. We scan the parameter space for astandard-model-like Higgs boson such that the mass is in the range of 124-127GeV and the production rate \sigma xB of the WW*, ZZ* modes are consistent withthe standard model (SM) values while that of \gamma\gamma is enhanced relativeto the SM value. We find that the SM-like Higgs boson is mostly the lightestCP-even Higgs boson and it has a strong mixing with the second lightest one,which is largely singlet-like. The implications on Z\gamma production rate andproperties of the other Higgs bosons are also studied.

Diphoton Rate of the Standard-Model-Like Higgs Boson in the Extra U(1) Extended MSSM