Standard Model with a distorted Higgs sector and the enhanced Higgs diphoton decay rate

Abstract

We propose a theoretical justification for the anomalous Higgs couplings without extending the particle content of the Standard Model, but rather assuming different realization of the electroweak symmetry and the representation of the Higgs field. Namely, the electroweak symmetry in our model is non-linearly realised with the Higgs field residing in the singlet representation of the electroweak gauge group. Within this framework we identify the simplest scenario with CP-violating Higgs-top coupling which explains the enhanced rate of $h\to \gamma \gamma$, while the Higgs production cross section is unaffected. Remarkably, this can be achieved with a reduced strength of the Higgs-top Yukawa coupling, $|y_t|<|y_t^{\mathrm{SM}}|$, and, thus, the electroweak vacuum stability problem may also be resolved in our scenario without invoking new physics below the Planck scale. In addition, models with the distorted Higgs sector provide a new framework for potentially successful electroweak baryogenesis.

arXiv comment7 pages, 1 figure. V2: references added

References in corpus (15)

• Observation of a new particle in the search for the Standard Model Higgs boson with the ATLAS detector at the LHC
• Observation of a new boson at a mass of 125 GeV with the CMS experiment at the LHC
• Higgs After the Discovery: A Status Report
• Interpreting LHC Higgs Results from Natural New Physics Perspective
• Is the resonance at 125 GeV the Higgs boson?
• A Higgs Conundrum with Vector Fermions
• 2:1 for Naturalness at the LHC?
• Modified Higgs branching ratios versus CP and lepton flavor violation
• Does $H\to \gamma \gamma$ Taste like vanilla New Physics?
• 125 GeV Higgs Boson, Enhanced Di-photon Rate, and Gauged U(1)_PQ-Extended MSSM
• Determining Higgs couplings with a model-independent analysis of h ->gamma gamma
• Vectorlike Fermions and Higgs Couplings
• Vacuum Instabilities with a Wrong-Sign Higgs-Gluon-Gluon Amplitude
• CP Violation in Higgs Diphoton Decay in Models with Vectorlike Heavy Fermions
• Higgs Uncovering Light Scalar Remnants of High Scale Matter Unification

Cited by in corpus (13)

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• Probing Charged Matter Through Higgs Diphoton Decay, Gamma Ray Lines, and EDMs
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• Electroweak Baryogenesis with Anomalous Higgs Couplings
• Diphoton Decay Excess and 125 GeV Higgs Boson in Gauge-Higgs Unification
• Can New Colored Particles Illuminate the Higgs?
• H to Z gamma in Gauge-Higgs Unification
• Simple fermionic dark matter models and Higgs boson couplings
• Vacuum stability bounds on Higgs coupling deviations
• 125 GeV Higgs Boson and TeV Scale Colored Fermions in Gauge-Higgs Unification
• Enhancing $t\bar{t}hh$ production through CP-violating top-Higgs interaction at the LHC, ILC and a 100 TeV collider