Constraints on the universal varying Yukawa couplings: from SM-like to fermiophobic

Li, Tianjun; Wan, X.; Wang, You-kai; Zhu, Shou-hua

doi:10.1007/jhep09(2012)086

Cited by 20 publications

(3 citation statements)

References 24 publications

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“…We have considered a two-dimensional parameter space characterized by rescaling factors (a, c) for the possible h couplings to massive vector bosons and fermions, respectively [28][29][30][31][32][33][34][35][36]. We have also considered the potential impacts of modifications to the loop-induced gg and γγ couplings that might be induced by additional massive particles, specifically possible conformal QCD and/or QED sectors in the pseudo-dilaton scenario [38][39][40][41][42][43][44].…”

Section: Summary and Prospectsmentioning

confidence: 99%

Global analysis of experimental constraints on a possible Higgs-like particle with mass ∼ 125 GeV

Ellis

You

2012

J. High Energ. Phys.

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Abstract:We perform a global analysis of the constraints on a possible Higgs-like particle with mass ∼ 125 GeV that are provided by the ATLAS, CDF, CMS and D0 experiments. We combine the available constraints on possible deviations from the Standard Model Higgs couplings to massive vector bosons and to fermions, considering also the possibilities of non-standard loop-induced couplings to photon and gluon pairs. We analyze the combined constraints on pseudo-dilaton scenarios and on some other scenarios in which the possible new particle is identified as a pseudo-Nambu-Goldstone boson in a composite electroweak symmetry-breaking sector.

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Section: Summary and Prospectsmentioning

confidence: 99%

Global analysis of experimental constraints on a possible Higgs-like particle with mass ∼ 125 GeV

Ellis

You

2012

J. High Energ. Phys.

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“…The experimental results so far present us with tantalizing hints that σ × Br(h → γ γ ) may be substantially larger than the SM prediction [3,4]. Indeed, a number of groups of theorists have attempted to fit the data allowing for non-SM Higgs couplings, both before [5][6][7][8][9][10][11][12][13][14][15] and after [16][17][18][19][20][21][22][23][24] the 4 July 2012 discovery announcement.…”

Section: Introductionmentioning

confidence: 99%

Vacuum instabilities with a wrong-sign Higgs–gluon–gluon amplitude

Reece

2013

New J. Phys.

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The recently discovered 125 GeV boson appears very similar to a Standard Model (SM) Higgs, but with data favoring an enhanced h → γ γ rate. A number of groups have found that fits would allow (or, less so after the latest updates, prefer) that the htt coupling have the opposite sign. This can be given meaning in the context of an electroweak chiral Lagrangian, but it might also be interpreted to mean that a new colored and charged particle runs in loops and reinforces the W -loop contribution to h F F, while also producing the oppositesign hGG amplitude to that generated by integrating out the top. Due to a correlation in sign of the new physics amplitudes, when the SM h F F coupling is enhanced the hGG coupling is decreased. Thus, in order to not suppress the rate of h → W W and h → Z Z , which appear to be approximately SM-like, one would need the loop to 'overshoot', not only canceling the top contribution but producing an opposite-sign hGG vertex of about the same magnitude as that in the SM. We argue that most such explanations have severe problems with fine-tuning and, more importantly, vacuum stability. In particular, the case of stop loops producing an opposite-sign hGG vertex of the same size as the SM one is ruled out by a combination of vacuum decay bounds and Large Electron-Positron Collider (LEP) constraints. We also show that scenarios with a sign flip from loops of color octet charged scalars or new fermionic states are highly constrained.

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“…For a partial list of recent work on Higgs coupling fits at the LHC, see e.g [34,[37][38][39][40][41][42][43][44][45][46][47][48][49][50][51]…”

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confidence: 99%

Searching for Signs of the Second Higgs Doublet

Craig¹,

Galloway²,

Thomas³

2013

Preprint

152

243

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The search for evidence of extended electroweak symmetry breaking has entered a new phase with the discovery of a Standard Model (SM)-like Higgs at the LHC. The measurement of Higgs couplings and direct searches for additional scalars provide complementary avenues for the discovery of new degrees of freedom. This complementarity is particularly sharp in two Higgs doublet models (2HDMs) where the couplings of the SM-like Higgs may be directly related to the LHC signals of additional scalars. In this work we develop a strategy for searching for the second Higgs doublet given the LHC signals of the recently discovered SM-like Higgs. We focus on a motivated parameter space of flavor-and CP-conserving 2HDMs in which the couplings of all scalars to SM states are controlled by two parameters. We construct fits in this parameter space to the signals of the SM-like Higgs and translate these fits into signal expectations for future measurements of both the SM-like Higgs and additional scalars, identifying the most promising search channels for discovery or exclusion of new physics. When kinematically accessible, decays of the heavy neutral scalar Higgs to two light Higgs scalars, H → hh, and decays of the pseudoscalar Higgs to a light Higgs scalar and Z boson, A → Zh, provide promising avenues for discovery even when the couplings of the light Higgs are within a few percent of SM predictions. When the couplings of the light Higgs are exceptionally close to those of the SM, decays of heavier neutral scalars to γγ and τ + τ − become particularly important for discovery.

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Constraints on the universal varying Yukawa couplings: from SM-like to fermiophobic

Cited by 20 publications

References 24 publications

Global analysis of experimental constraints on a possible Higgs-like particle with mass ∼ 125 GeV

Global analysis of experimental constraints on a possible Higgs-like particle with mass ∼ 125 GeV

Vacuum instabilities with a wrong-sign Higgs–gluon–gluon amplitude

Searching for Signs of the Second Higgs Doublet

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