One-loop corrections to the perturbative unitarity bounds in the CP-conserving two-Higgs doublet model with a softly broken ℤ 2 $$ {\mathrm{\mathbb{Z}}}_2 $$ symmetry

Grinstein, Benjamı́n; Murphy, Christopher W.; Uttayarat, Patipan

doi:10.1007/jhep06(2016)070

Cited by 61 publications

(65 citation statements)

References 60 publications

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“…The unitarity of the S-matrix can be used to place constraints on the parameters of a theory [42] (see also [14,28,[43][44][45][46][47]). If a certain combination of parameters becomes too large, an amplitude will appear to be non-unitary at a given order in perturbation theory.…”

Section: B Unitaritymentioning

confidence: 99%

“…This algorithm is built on previous work in Ref. [28,29], and results for the special case of the 2HDM can be found in those references. The NLO contribution to the eigenvalue is given by a sum of two terms a (1)…”

Section: B Unitaritymentioning

confidence: 99%

“…In this paper, we utilize the generic tool provided by Ref. [28][29][30] to explore these perturbative unitarity bounds at next-to-leading order (NLO) and firstly impose them on color-octet scalar. On the other hand, the positivity conditions are only known for 2HDM.…”

Section: Introductionmentioning

confidence: 99%

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Novel theoretical constraints for color-octet scalar models *

2019

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We study theoretical constraints on a model whose scalar sector contains one color octet and one or two color singlet SU (2) L doublets. Using the unitarity of the theory, we constrain the parameters of the scalar potential for the first time at next-to-leading order in perturbation theory. We also derive new conditions guaranteeing the stability of the potential. We use the HEPfit package to single out the viable parameter regions at the electroweak scale and test the stability of the renormalization group evolution up to the multi-TeV region. Additionally, we set upper limits on the scalar mass splittings. All results are given for both cases, with and without a second scalar color singlet.

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Section: B Unitaritymentioning

confidence: 99%

Section: B Unitaritymentioning

confidence: 99%

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Novel theoretical constraints for color-octet scalar models *

2019

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“…3 Note that those couplings deviate from the SM prediction at higher orders [24,25]. 4 Notice that if we use criteria other than the tree-level unitarity such as the unitarity bounds at one-loop level [31] or the triviality bounds [23,32,33], the parameter space can be more restricted. [36,37].…”

Section: A Inert Doublet Modelmentioning

confidence: 99%

Single Higgs production in association with a photon at electron-positron colliders in extended Higgs models

2019

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We study associated Higgs production with a photon at electron-positron colliders, e + e − → hγ, in various extended Higgs models, such as the inert doublet model (IDM), the inert triplet model (ITM) and the two Higgs doublet model (THDM). The cross section in the standard model (SM) is maximal around √ s = 250 GeV, and we present how and how much the new physics can enhance or reduce the production rate. We also discuss the correlation with the h → γγ and h → Zγ decay rates. We find that, with a sizable coupling to a SMlike Higgs boson, charged scalars can give considerable contributions to both the production and the decay if their masses are around 100 GeV. Under the theoretical constraints from vacuum stability and perturbative unitarity as well as the current constraints from the Higgs measurements at the LHC, the production rate can be enhanced from the SM prediction at most by a factor of two in the IDM. In the ITM, in addition, we find a particular parameter region where the hγ production significantly increases by a factor of about six to eight, but the h → γγ decay still remains as in the SM. In the THDM, possible deviations from the SM prediction are minor in the viable parameter space.

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“…This is guaranteed at the one-loop level together with the assumption of convergence of the perturbation series, i.e. enforcing the next-to-leading order contribution to be smaller in magnitude than the tree-level expression [9,10]. I will refer to the previously mentioned constraints as theoretical constraints in the following.…”

Section: Constraintsmentioning

confidence: 99%

Current status of Two-Higgs-Doublet models with a softly broken $Z_2$ symmetry

Eberhardt¹

2019

Proceedings of the 39th International Conference on High Energy Physics — PoS(ICHEP2018)

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One of the most popular extensions of the Standard Model is the Two-Higgs-Doublet model (2HDM), in which a second Higgs doublet is added to the conventional Standard Model particle content. 2HDM's with a softly broken Z 2 symmetry avoid flavour-changing neutral Higgs currents at tree-level. They also comprise the Higgs sector of the Minimal Supersymmetric Standard Model. Current Higgs observables put strong constraints on these models. We present global fits to these data and combine them with information from theoretical bounds, electroweak precision observables and the most important flavour constraints, using the open-source package HEPfit. The resulting limits on the 2HDM parameters like mixing angles, the heavy Higgs masses as well as the allowed Higgs mass splittings will be discussed.

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One-loop corrections to the perturbative unitarity bounds in the CP-conserving two-Higgs doublet model with a softly broken ℤ 2 $$ {\mathrm{\mathbb{Z}}}_2 $$ symmetry

Cited by 61 publications

References 60 publications

Novel theoretical constraints for color-octet scalar models *

Novel theoretical constraints for color-octet scalar models *

Single Higgs production in association with a photon at electron-positron colliders in extended Higgs models

Current status of Two-Higgs-Doublet models with a softly broken $Z_2$ symmetry

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