Effects of two inert scalar doublets on Higgs boson interactions and the electroweak phase transition

Ahriche, Amine; Faisel, Gaber; Ho, Shen‐Wu; Nasri, Salah; Tandean, Jusak

doi:10.1103/physrevd.92.035020

Cited by 23 publications

(14 citation statements)

References 102 publications

(142 reference statements)

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“…In this paper, we have focused on radiative neutrino mass model at one loop proposed in [1], known as the scotogenic model, where the scalar content of the model is the inert doublet. Apart from its role in neutrino mass generation, the inert doublet has been extensively studied in the context of dark matter [2][3][4][5][6][7][8][9], mirror model and extra generation [10,11], electroweak phase transition [12][13][14][15][16] and collider studies [17,18,21]. As the higher scalar representation is not forbidden by any symmetry in the model, the immediate generalization of the doublet, the quartet with isospin J = 3/2 was studied in [22] to check whether it is viable in providing both light scalar dark matter and strong electroweak phase transition in the universe.…”

Section: Jhep12(2015)040 1 Introductionmentioning

confidence: 99%

Lepton flavor violation in the inert scalar model with higher representations

Chowdhury

Nasri

2015

J. High Energ. Phys.

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Abstract:We investigate the lepton flavor violation (LFV) in the inert scalar model with higher representations. We generalize the inert doublet model with right handed neutrino by using higher scalar and fermion representation of SU(2) L . As the generalized model and the inert doublet model have the same parameter space, we compare the rates of µ → eγ, µ → eee and µ − e conversion in nuclei in the doublet and its immediate extension, the quartet model. We show that the corresponding rates are larger in the case of higher representation compared to the Inert doublet for the same region of parameter space. This implies that such extended models are more constrained by current LFV bounds and will have better prospects in future experiments.

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Section: Jhep12(2015)040 1 Introductionmentioning

confidence: 99%

Lepton flavor violation in the inert scalar model with higher representations

Chowdhury

Nasri

2015

J. High Energ. Phys.

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“…Adding further to it, the large number of bosonic degrees of freedom offered by the S 3 HDM could favour a strong first order electroweak phase transition, thereby making way for baryogenesis, something already looked at for a more generic 3HDM with two inert doublets. [64].…”

Section: Discussionmentioning

confidence: 99%

High-scale validity of a model with three Higgs doublets

Chakrabarty

2016

Phys. Rev. D

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We consider a three-Higgs doublet scenario in this paper, invariant under the discrete group S3, and probe its high-scale validity by allowing the model parameters to evolve under renormalisation group.We choose two particular alignments of vacuum expectation values (vev) for our study, out of a set of several such possible ones. All three doublets receive non-zero vacuum expectation values in the first case, and in the second case, two of the doublets remain without vev. The constraints on the parameter space at low energy, including the measured value of the Higgs mass and the signal strengths, oblique corrections and also measurements of relic density and direct detection rates are juxtaposed with the conditions of vacuum stability, perturbativity and unitarity at various scales. We find that the scenario with three non-zero vevs is not valid beyond 10 7 GeV, assuming no additional physics participates at the intermediate scales. On the contrary, the scenario with only one non-zero vev turns out to be a successful model for cold dark matter phenomenology, which also turns out to be valid up to the Planck scale at the same time. Stringent restrictions are obtained on the model parameter space in each case. Thus, the S3 symmetric scalar sector emerges as an ultraviolet (UV) complete theory. 1 nabarunc@hri.res.in 1 arXiv:1511.08137v2 [hep-ph] 22 Apr 2016 , m A1 , m A2 , m H1 , m H2 , c β−α } basis in scenario A and, {λ 1 , λ 2 , λ 3 , m H1 , m A1 , m H + 1 , λ L } in scenario B. We discuss below the various theoretical and experimental constraints imposed to shape the results. 6

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“…In the absence of the singlet scalar, we have derived the rates of the latter decays in Ref. [14]. Modifying the rate formulas in the presence ofs, we now have…”

Section: Decay Modes Ofsmentioning

confidence: 99%

“…[12] and has been examined for its interesting potential impact on the Higgs trilinear coupling and electroweak phase transition in Ref. [14].…”

Section: Introductionmentioning

confidence: 99%

Exploring high-mass diphoton resonance without new colored states

Ahriche¹,

Faisel²,

Nasri³

et al. 2017

Nuclear Physics B

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A new heavy resonance may be observable at the LHC if it has a significant decay branching fraction into a pair of photons. We entertain this possibility by looking at the modest excess in the diphoton invariant mass spectrum around 750 GeV recently reported in the ATLAS and CMS experiments. Assuming that it is a spinless boson, dubbeds, we consider it within a model containing two weak scalar doublets having zero vacuum expectation values and a scalar singlet in addition to the doublet responsible for breaking the electroweak symmetry. The model also possesses three Dirac neutral singlet fermions, the lightest one of which can play the role of dark matter and which participate with the new doublet scalars in generating light neutrino masses radiatively. We show that the model is consistent with all phenomenological constraints and can yield a production cross section σ(pp →s → γγ) of roughly the desired size, mainly via the photon-fusion contribution, without involving extra colored fermions or bosons. We also discuss other major decay modes ofs which are potentially testable in upcoming LHC measurements.

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Effects of two inert scalar doublets on Higgs boson interactions and the electroweak phase transition

Cited by 23 publications

References 102 publications

Lepton flavor violation in the inert scalar model with higher representations

Lepton flavor violation in the inert scalar model with higher representations

High-scale validity of a model with three Higgs doublets

Exploring high-mass diphoton resonance without new colored states

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