Higgs windows to new physics through d = 6 operators: constraints and one-loop anomalous dimensions

Abstract:We treat the Standard Model as the low-energy limit of an effective field theory that incorporates higher-dimensional operators to capture the effects of decoupled new physics. We consider the constraints imposed on the coefficients of dimension-6 operators by electroweak precision tests (EWPTs), applying a framework for the effects of dimension-6 operators on electroweak precision tests that is more general than the standard S, T formalism, and use measurements of Higgs couplings and the kinematics of associated Higgs production at the Tevatron and LHC, as well as triple-gauge couplings at the LHC. We highlight the complementarity between EWPTs, Tevatron and LHC measurements in obtaining model-independent limits on the effective Standard Model after LHC Run 1. We illustrate the combined constraints with the example of the two-Higgs doublet model.

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“…These are related to the coefficients at the new physics scale through RGE equations [110][111][112][113][114][115][116][117].…”

Section: Jhep03(2015)157mentioning

confidence: 99%

The effective Standard Model after LHC Run I

Ellis

Sanz

You

2015

J. High Energ. Phys.

158

176

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“…In the Standard Model (SM), in fact, the Higgs boson is unstable under radiative corrections to its mass, so that it should be as heavy as the Planck scale, M P ∼ 10 19 GeV. This expectation is, however, of many orders of magnitude incompatible with the experimental results, that indicate the existence of a Higgs-like scalar resonance with mass M H ∼ 125 GeV.…”

Section: Introductionmentioning

confidence: 99%

“…The background-dependent twin top mass at a generic order in t is now defined as: 19) where the last three additional terms correspond to the solution of the previous β-functions in the Higgs spectator field. This formula together with the RG equations are the basic elements to compute the Higgs potential at NNLL.…”

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confidence: 99%

The RG-improved Twin Higgs effective potential at NNLL

Greco¹,

Mimouni²

2016

J. High Energ. Phys.

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We present the Renormalization Group improvement of the Twin Higgs effective potential at cubic order in logarithmic accuracy. We first introduce a modelindependent low-energy effective Lagrangian that captures both the pseudo-Nambu-Goldstone boson nature of the Higgs field and the twin light degrees of freedom charged under a copy of the Standard Model. We then apply the background field method to systematically re-sum all the one loop diagrams contributing to the potential. We show how this technique can be efficient to implicitly renormalize the higher-dimensional operators in the twin sector without classifying all of them. A prediction for the Higgs mass in the Twin Higgs model is derived and found to be of the order of M H ∼ 120 GeV with an ultraviolet cut-off m * ∼ 10-20 TeV. Irrespective of any possible ultraviolet completion of the lowenergy Lagrangian, the infrared degrees of freedom alone are therefore enough to account for the observed value of the Higgs mass through running effects.

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“…Very often it is assumed that the new physics effects are decoupled from the SM sector, thereby can be described by nonrenormalizable higher dimensional operators [6][7][8][9][10][11]. This assumption encompasses a large class of BSMs, but still leaves out another large class of BSMs with an isospin-singlet scalar boson (of a mass around the electroweak (EW) scale) that could mix with the SM Higgs boson.…”

mentioning

confidence: 99%

Bounds on Higgs-portal models from the LHC Higgs data

Cheung

Ko²,

Lee

et al. 2015

J. High Energ. Phys.

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In a number of Higgs-portal models, an SU(2) isospin-singlet scalar boson generically appears at the electroweak scale and can mix with the Standard Model (SM) Higgs boson with a mixing angle α. This singlet scalar boson can have renormalizable couplings to a pair of dark matter particles, vector-like leptons or quarks, or new gauge bosons, thereby modifying the Higgs signal strengths in a nontrivial way. In this work, we perform global fits to such models using the most updated LHC Higgs-boson data and discuss the corresponding implications on Higgs-portal-type models. In particular we find that the current LHC Higgs-boson data slightly favors the SM over the Higgs-portal singlet-scalar models, which has to be further examined using the upcoming LHC Higgsboson data. Finally, without non-SM particles contributing to the Hγγ and Hgg vertices, the Higgs-portal models are constrained as follows: cos α 0.86 and ∆Γ tot 1.24 MeV at 95% confidence level (CL).

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Higgs windows to new physics through d = 6 operators: constraints and one-loop anomalous dimensions

Cited by 201 publications

References 29 publications

The effective Standard Model after LHC Run I

The effective Standard Model after LHC Run I

The RG-improved Twin Higgs effective potential at NNLL

Bounds on Higgs-portal models from the LHC Higgs data

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