  Both the ATLAS and CMS experiments at the LHC have reported the observation
of the particle of mass around 125GeV which is consistent to the Standard Model
(SM) Higgs boson, but with an excess of events beyond the SM expectation in the
diphoton decay channel at each of them. There still remains room for a logical
possibility that we are not seeing the SM Higgs but something else. Here we
introduce the minimal dilaton model in which the LHC signals are explained by
an extra singlet scalar of the mass around 125GeV that slightly mixes with the
SM Higgs heavier than 600GeV. When this scalar has a vacuum expectation value
well beyond the electroweak scale, it can be identified as a linearly realized
version of a dilaton field. Though the current experimental constraints from
the Higgs search disfavors such a region, the singlet scalar model itself still
provides a viable alternative to the SM Higgs in interpreting its search
results.
