The decay constant of the holographic techni-dilaton and the 125 GeV boson
arXiv:1208.0546 · doi:10.1016/j.nuclphysb.2012.10.019
Abstract
We critically discuss the possibility that the 125 GeV boson recently discovered at the LHC is the holographic techni-dilaton, a composite state emerging from a strongly-coupled model of electroweak symmetry breaking. This composite state differs from the SM for three main reasons. Its decay constant is in general larger than the electroweak scale, hence suppressing all the couplings to standard model particles with respect to an elementary Higgs boson, with the exception of the coupling to photons and gluons, which is expected to be larger than the standard-model equivalent. We discuss three classes of questions. Is it possible to lower the decay constant, by changing the geometry of the holographic model? Is it possible to lower the overall scale of the strong dynamics, by modifying the way in which electroweak symmetry breaking is implemented in the holographic model? Is there a clear indication in the data that production mechanisms other than gluon-gluon fusion have been observed, disfavoring models in which the holographic techni-dilaton has a large decay constant? We show that all of these questions are still open, given the present status of theoretical as well as phenomenological studies, and that at present the techni-dilaton hypothesis yields a fit to the data which is either as good as the elementary Higgs hypothesis, or marginally better, depending on what sets of data are used in the fit. We identify clear strategies for future work aimed at addressing these three classes of open questions. In the process, we also compute the complete scalar spectrum of the two-scalar truncation describing the GPPZ model, as well as the decay constant of the holographic techni-dilaton in this model.
23 pages, 7 figures. Two paragraphs of general comments added. Several references added. Version accepted for publication
References in corpus (10)
- Light scalar at LHC: the Higgs or the dilaton?
- A negative S parameter from Holographic Technicolor
- Glueballs vs. Gluinoballs: Fluctuation Spectra in Non-AdS/Non-CFT
- Holographic Estimate of Oblique Corrections for Technicolor
- Light scalars from a compact fifth dimension
- Holographic Electroweak Symmetry Breaking from D-branes
- Dynamical electro-weak symmetry breaking from deformed AdS: vector mesons and effective couplings
- Electroweak Symmetry Breaking from Gauge/Gravity Duality
- Holographic Construction of Technicolor Theory
- Holographic technicolor models and their S-parameter
Cited by in corpus (46)
- QCD and strongly coupled gauge theories: challenges and perspectives
- Global fit to Higgs signal strengths and couplings and implications for extended Higgs sectors
- A Higgslike Dilaton
- Effective Theory of a Light Dilaton
- Phase Transitions in Particle Physics -- Results and Perspectives from Lattice Quantum Chromo-Dynamics
- Alternatives to an Elementary Higgs
- Multiscale confining dynamics from holographic RG flows
- Dynamic AdS/QCD and the Spectrum of Walking Gauge Theories
- Oblique S and T Constraints on Electroweak Strongly-Coupled Models with a Light Higgs
- Gravitation waves from QCD and electroweak phase transitions
- Color dependence of tensor and scalar glueball masses in Yang-Mills theories
- Pseudo-spontaneous Symmetry Breaking in Hydrodynamics and Holography
- Calculable mass hierarchies and a light dilaton from gravity duals
- Higgs Phenomenology in the Minimal Dilaton Model after Run I of the LHC
- Glueballs on the Baryonic Branch of Klebanov-Strassler: dimensional deconstruction and a light scalar particle
- Higgs-dilaton(radion) system confronting the LHC Higgs data
- Holographic models of composite Higgs in the Veneziano limit. Part I. Bosonic sector
- S-parameter, Technimesons, and Phase Transitions in Holographic Tachyon DBI Models
- Light scalar from deformations of the Klebanov-Strassler background
- Meson spectra of asymptotically free gauge theories from holography
- The Yang-Mills gradient flow and SU(3) gauge theory with 12 massless fundamental fermions in a colour-twisted box
- On the stability of multi-scale models of dynamical symmetry breaking from holography
- Interactions of a Stabilized Radion and Duality
- Hyperscaling violation and Electroweak Symmetry Breaking
- Towards top-down holographic composite Higgs: minimal coset from maximal supergravity
- Probing the holographic dilaton
- A light dilaton in a metastable vacuum
- The Coulomb branch of N=4 SYM and dilatonic scions in supergravity
- Generalized Skyrmions in QCD and the Electroweak Sector
- Dilatonic states near holographic phase transitions
- A Higgs Impostor in Low-Scale Technicolor
- Higgs-strahlung production process e^+ e^- \to Z h at the future Higgs factory in the Minimal Dilaton Model
- Higgs decay into photons through a spin-2 loop
- 126 GeV Higgs boson in the top-seesaw model
- Hyper-Scaling Relations in the Conformal Window from Dynamic AdS/QCD
- Determination of SU(4) Technicolor Gauge Group from Embedding in Extended Technicolor
- Bubble nucleation and gravitational wave from holography
- Phase transitions and light scalars in bottom-up holography
- Glueball Spectrum in a Gauge Theory with Two Dynamical Scales
- Lattice Gauge Theories at the Energy Frontier
- Peccei-Quinn violating minimal supergravity and a 126 GeV Higgs
- Light dilaton near critical points in top-down holography
- Standard Model-like corrections to Dilatonic Dynamics
- On the presentation of the LHC Higgs Results
- Higgs, supersymmetry and dark matter after Run I of the LHC
- Holographic Technicolor Model and Dark Matter