Measuring hidden Higgs and strongly-interacting Higgs scenarios

Böck, Sebastian; Lafaye, R.; Plehn, Tilman; Rauch, Michael; Zerwas, D.; Zerwas, P.M.

doi:10.1016/j.physletb.2010.09.032

Cited by 52 publications

(54 citation statements)

References 66 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%

“…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 simplest model, motivated for example by a Higgs portal [69][70][71][72][73][74][75] or a single form factor from a strongly interacting Higgs sector [77], consists of a universal coupling modification ∆ H . Such a coupling modification is constrained to around 3% at 68% CL, in The second simplest model is a universal coupling modification for the Higgs interaction with the gauge bosons ∆ V , and one modification for the coupling with the fermions ∆ f .…”

Section: Standard Model Couplingsmentioning

confidence: 99%

See 2 more Smart Citations

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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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%

Section: Jhep08(2015)156mentioning

confidence: 99%

Section: Standard Model Couplingsmentioning

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

158

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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%

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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“…In particular, the increasing precision on the 125 GeV Higgs couplings (see e.g. [101][102][103]) will allow us to explore the coupling strength deviations in the 5%-range, which will provide stringent constraints (see figure 2) on the model. Direct searches are not constraining on the top partner mass m t but when combined with lattice determinations the situation may change.…”

Section: Discussionmentioning

confidence: 99%

A UV complete compositeness scenario: LHC constraints meet the lattice

Debbio

Englert

Zwicky

2017

J. High Energ. Phys.

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We investigate a recently proposed UV-complete composite Higgs scenario in the light of the first LHC runs. The model is based on a SU(4) gauge group with global flavour symmetry breaking SU(5) → SO(5), giving rise to pseudo Nambu-Goldstone bosons in addition to the Higgs doublet. This includes a real and a complex electroweak triplet with exotic electric charges. Including these, as well as constraints on other exotic states, we show that LHC measurements are not yet sensitive enough to significantly constrain the model's low energy constants. The Higgs potential is described by two parameters which are on the one hand constrained by the LHC measurement of the Higgs mass and Higgs decay channels and on the other hand can be computed from correlation functions in the UV-complete theory. Hence to exclude the model at least one constant needs to be determined and to validate the Higgs potential both constants need to be reproduced by the UV-theory. Due to its UV-formulation, a certain number of low energy constants can be computed from first principle numerical simulations of the theory formulated on a lattice, which can help in establishing the validity of this model. We assess the potential impact of lattice calculations for phenomenological studies, as a preliminary step towards Monte Carlo simulations.

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Measuring hidden Higgs and strongly-interacting Higgs scenarios

Cited by 52 publications

References 66 publications

The Higgs legacy of the LHC Run I

The Higgs legacy of the LHC Run I

LHC: Standard Higgs and hidden Higgs

A UV complete compositeness scenario: LHC constraints meet the lattice

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