Higgs-dilaton(radion) system confronting the LHC Higgs data

Abstract

We consider the Higgs-dilaton(radion) system using the trace of energy-momentum tensor ($T_{\mu }^{\mu }$) with the full Standard Model (SM) gauge symmetry $G_{\mathrm{SM}}\equiv SU(3{)}_c\times SU(2{)}_L\times U(1{)}_Y$, and find out that the resulting phenomenology for the Higgs-dilaton(radion) system is distinctly different from the earlier studies based on the $T_{\mu }^{\mu }$ with the unbroken subgroup $H_{\mathrm{SM}}\equiv SU(3{)}_c\times U(1{)}_{\mathrm{em}}$ of $G_{\mathrm{SM}}$. After electroweak symmetry breaking (EWSB), the SM Higgs boson and dilaton(radion) will mix with each other, and there appear two Higgs-like scalar bosons and the Higgs-dilaton mixing changes the scalar phenomenology in interesting ways. The signal strengths for the $gg$-initiated channels could be modified significantly compared with the SM predictions due to the QCD scale anomaly and the Higgs-dilaton(radion) mixing, whereas anomaly contributions are almost negligible for other channels. We also discuss the self-couplings and the signal strengths of the $126$ GeV scalar boson in various channels and possible constraints from the extra light/heavy scalar boson. The Higgs-dilaton(radion) system considered in this work has a number of distinctive features that could be tested by the upcoming LHC running and at the ILC.

Minor corrections, including a few new figures, version appearing in Physics Letters B

References in corpus (9)

• Observation of a new boson at a mass of 125 GeV with the CMS experiment at the LHC
• Light scalar at LHC: the Higgs or the dilaton?
• Conformal Symmetry and the Standard Model
• A solution to the hierarchy problem from an almost decoupled hidden sector within a classically scale invariant theory
• Scale invariant extension of the standard model with strongly interacting hidden sector
• Electroweak Higgs as a pseudo-Goldstone boson of broken scale invariance
• Neutrino mass in radiatively-broken scale-invariant models
• Search for the Standard Model Higgs boson in the H -> WW(*) -> l nu l nu decay mode with 4.7 /fb of ATLAS data at sqrt(s) = 7 TeV
• Higgs-Radion Mixing with Enhanced Di-Photon Signal

Cited by in corpus (22)

• Baryogenesis from Strong CP Violation and the QCD Axion
• AdS/QCD approach to the scale-invariant extension of the standard model with a strongly interacting hidden sector
• An ultra-weak sector, the strong CP problem and the pseudo-Goldstone dilaton
• A light dilaton at the LHC
• Scalar dark matter in the conformally invariant extension of the standard model
• Higgs-radion similarity in production processes involving off-shell fermions
• Higgs-radion mixing in stabilized brane world models
• Hyperscaling violation and Electroweak Symmetry Breaking
• Interactions of a Stabilized Radion and Duality
• Higgs-strahlung production process e^+ e^- \to Z h at the future Higgs factory in the Minimal Dilaton Model
• Mixed Higgs-Radion States at the LHC -- a Detailed Study
• Probing the dilaton in central exclusive processes at the LHC
• Probing the light radion through diphotons at the Large Hadron Collider
• Constraints on CP-odd ALP couplings from EDM limits of fermions
• Heavy dark matter through the dilaton portal
• Dilaton at the LHC: Complementary Probe of Composite Higgs
• Comparison of associated Higgs boson-radion and Higgs boson pair production processes
• Kinetic mixing between a Higgs and a nearly degenerate Dark scalar: oscillations and displaced vertices
• The Dilaton-like Higgs boson with scalar singlet dark matter
• Production of exotic particles in electron-positron collisions
• The $\gamma b\overline{b}$ production via ${\gamma }^{\ast }{\gamma }^{\ast }$ collisions at the ILC and LHC
• The cross-section for the $\gamma e^{-}\to Z{e}^{-}\to l^{-}{l}^{+}{e}^{-}$ scattering at the LHeC