Exploring the Higgs portal

Englert, Christoph; Plehn, Tilman; Zerwas, D.; Zerwas, P.M.

doi:10.1016/j.physletb.2011.08.002

Cited by 185 publications

(158 citation statements)

References 54 publications

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“…The experimental challenge would be to distinguish such a scenario for example from a Higgs portal where the SM Higgs state mixes with a heavy additional scalar, see e.g. [69][70][71][72][73][74][75]. In this situation the off-shell Higgs rate measurement will be extremely useful.…”

Section: Fit Setupmentioning

confidence: 99%

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The Higgs legacy of the LHC Run I

Corbett

Éboli

Gonçalves

et al. 2015

J. High Energ. Phys.

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127

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Based on Run I data we present a comprehensive analysis of Higgs couplings. For the first time this SFitter analysis includes independent tests of the Higgs-gluon and top Yukawa couplings, Higgs decays to invisible particles, and off-shell Higgs measurements. The observed Higgs boson is fully consistent with the Standard Model, both in terms of coupling modifications and effective field theory. Based only on Higgs total rates the results using both approaches are essentially equivalent, with the exception of strong correlations in the parameter space induced by effective operators. These correlations can be controlled through additional experimental input, namely kinematic distributions. Including kinematic distributions the typical Run I reach for weakly interacting new physics now reaches 300 to 500 GeV.

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Section: Fit Setupmentioning

confidence: 99%

“…We use their values for finite loop masses, while their normalization is illustrated by the limit F (∞) G → α s /(12π) for a heavy top mass. The invisible decay width can for example be generated in a Higgs portal model [69][70][71][72][73][74][75] and will be quoted in terms of an invisible branching ratio.…”

Section: Jhep08(2015)156mentioning

confidence: 99%

The Higgs legacy of the LHC Run I

Corbett

Éboli

Gonçalves

et al. 2015

J. High Energ. Phys.

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127

158

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“…In our simple model we couple the additional scalar to the Standard Model through a Higgs portal [72][73][74][75][76][77][78][79][80][81][82][83][84][85][86][87][88][89][90][91] added to the effective potential of eq. (2.6),…”

Section: Jhep04(2015)022mentioning

confidence: 99%

The Higgs mass and the scale of new physics

Eichhorn

Gies

Jaeckel

et al. 2015

J. High Energ. Phys.

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In view of the measured Higgs mass of 125 GeV, the perturbative renormalization group evolution of the Standard Model suggests that our Higgs vacuum might not be stable. We connect the usual perturbative approach and the functional renormalization group which allows for a straightforward inclusion of higher-dimensional operators in the presence of an ultraviolet cutoff. In the latter framework we study vacuum stability in the presence of higher-dimensional operators. We find that their presence can have a sizable influence on the maximum ultraviolet scale of the Standard Model and the existence of instabilities. Finally, we discuss how such operators can be generated in specific models and study the relation between the instability scale of the potential and the scale of new physics required to avoid instabilities.

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“…Vacuum expectation values of the Higgs fields build up the Higgs mass parameters in the two sectors as well as their coupling. Diagonalizing the standard-hidden Higgs mass matrix [squared] * , generates the mass eigenvalues M 2 1 < M 2 2 and rotates the standard-hidden Higgs states H s , H h to the * The essential elements of the formalism [8,9] are summarized briefly in this introductory section as to render the letter self-contained for the reader's convenience. …”

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confidence: 99%

“…Both these questions have been addressed [8,9] at the theoretical level in a standard-hidden Higgs scenario. The present sequel will include the recent LHC results on the Higgs sector in the analysis.…”

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confidence: 99%

LHC: Standard Higgs and hidden Higgs

Englert¹,

Plehn²,

Rauch³

et al. 2012

Physics Letters B

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101

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Interpretations of Higgs searches critically involve production cross sections and decay probabilities for different analysis channels. Mixing effects can reduce production rates, while invisible decays can reduce decay probabilities. Both effects may transparently be quantified in Higgs systems where a visible Higgs boson is mixed with a hidden sector Higgs boson. Recent experimental exclusion bounds can be re-interpreted in this context as a sign for non-standard Higgs properties. Should a light Higgs boson be discovered, then our analysis will quantify how closely it may coincide with the Standard Model. [5, 6], so that each experiment alone has about the same sensitivity as the combination in the low mass region, raising the low-mass bound of the Higgs from the LEP2 limit [7] of 114.4 GeV to 115.5/115 GeV and leading to an exclusion of the mass from 131 GeV/127 GeV to 453 GeV/600 GeV by ATLAS/CMS, respectively. Bounds as low as fractions R ≤ 0.3 have been set on the production cross sections with respect to the Standard Model [SM] for some of the masses probed. Given the far reaching consequences, the question arises naturally to what extent Higgs bosons, in slightly generalized scenarios, may still exist in this mass region.On the other hand, a gap from about 130 GeV down to the low-mass limit of about 115 GeV is left, presently, in which a SM-type Higgs signal can be expected to either rise up or plunge in the near future [5, 6]. When a Higgs boson will indeed be discovered in this mass range, the standard-hidden Higgs scenario allows to quantify how well the global properties of the particle coincide with the predictions of the Standard Model.Both these questions have been addressed [8,9] at the theoretical level in a standard-hidden Higgs scenario. The present sequel will include the recent LHC results on the Higgs sector in the analysis. The ground for the fundamental idea to use the Higgs boson as a portal to a novel hidden sector in nature has been laid for general model structures in Ref. [11]. Phenomenological implications [12] can then be studied in specific frameworks like hidden valleys [13]. Other than the Higgs portal there exist two additional portal-type interactions in a renormalizable theory, namely kinetic U (1) mixing [14] and mixing with sterile neutrinos [15].The experimentally observed rates depend on the Higgs production cross sections and the decay branching ratios [16]. In scenarios in which the standard Higgs boson is mixed with another Higgs boson, originating from a hidden sector for instance, the production cross sections are reduced universally by the mixing parameter and, in addition, the visible branching ratios may be lowered by decays into invisible channels induced by mixing. Throughout this paper we will consider the minimal Standard Model Higgs sector as the activator of the visible Higgs boson [17], but the same arguments trivially hold for extended visible Higgs sectors, for example in supersymmetry or other extensions to the Standard Model [18]. In the early theoret...

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Exploring the Higgs portal

Cited by 185 publications

References 54 publications

The Higgs legacy of the LHC Run I

The Higgs legacy of the LHC Run I

The Higgs mass and the scale of new physics

LHC: Standard Higgs and hidden Higgs

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