Abstract
Both the ATLAS and CMS experiments at the LHC have reported the observation of the particle of mass around 125 GeV 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 125 GeV that slightly mixes with the SM Higgs heavier than 600 GeV. 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.
Highlights
Both the ATLAS and CMS experiments at the LHC have reported the observation of the particle of mass around 125 GeV 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
We introduce the minimal dilaton model in which the LHC signals are explained by an extra singlet scalar of the mass around 125 GeV that slightly mixes with the SM Higgs heavier than 600 GeV
The ATLAS [1] and CMS [2] experiments have reported the observation of the particle of mass 125 GeV that is consistent with the Standard Model (SM) Higgs boson, but with an excess of events in the diphoton decay channel with the signal strength 1.80 ± 0.30 ± 0.7 at ATLAS [3] and 1.6+−00..76 at CMS [4]
Summary
The ATLAS [1] and CMS [2] experiments have reported the observation of the particle of mass 125 GeV that is consistent with the Standard Model (SM) Higgs boson, but with an excess of events in the diphoton decay channel with the signal strength 1.80 ± 0.30 ± 0.7 at ATLAS [3] and 1.6+−00..76 at CMS [4]. We report the minimal dilaton model [5] in which the observed particle is identified as the SM singlet scalar field S of mass around 125 GeV that slightly mixes with the SM Higgs H heavier than 600 GeV. We take more conservative approach that the SM except for the top/Higgs sector is a spectator of the dynamics, and the dilaton S couples to the W, Z bosons and to light fermions only through the mixing with the Higgs fields H, while the couplings to the gluons and photons are generated only through the loops of the top quark and its partner Due to these different origin of the couplings between two models, the production and decay properties are quite different.
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