Updated constraints on the Georgi-Machacek model and its electroweak phase transition and associated gravitational waves

Chen, Ting-Kuo; Chiang, Cheng‐Wei; Cheng-Tse, Huang,; Lu, B.

doi:10.1103/physrevd.106.055019

Cited by 8 publications

(3 citation statements)

References 152 publications

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“…In this paper, we discuss a model with a real and a complex isospin triplet Higgs fields as the minimal extension of the Higgs sector such that it contains new sources of CPV and keeps the electroweak rho parameter to unity at tree level, but not introducing quark FCNCs via tree-level Higgs mediations. The field content is actually the same as that of the Georgi-Machacek (GM) model [16,17] which can realize the strong firstorder electroweak phase transition [18][19][20] under the theoretical and current experimental constraints. The original GM model is, however, forbidden to have new CPV sources due to the global SU(2) L × SU(2) R symmetry in the potential, imposed to preserve the custodial SU(2) V symmetry after the spontaneous symmetry breaking.…”

Section: Jhep06(2023)069mentioning

confidence: 93%

CP violation in a model with Higgs triplets

Chen

Chiang

Yagyu

2023

J. High Energ. Phys.

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We discuss CP-violation in a model with a real and a complex isospin triplet Higgs fields without introducing any symmetries except for the electroweak gauge symmetry. This corresponds to the minimal extension of the Higgs sector with the following properties: (i) providing new source of CP violation, (ii) absence of quark flavor changing neutral currents at tree level, and (iii) enabling the electroweak rho parameter to be unity at tree level in the scenario without imposing any new symmetries. Our model can be regarded as the generalized version of the Georgi-Machacek model, in which the global SU(2)L × SU(2)R symmetry is explicitly broken due to CP-violating terms in the potential. We present analytic formulas for theoretical constraints from perturbative unitarity and vacuum stability as well as contributions to the electron electric dipole moment (EDM) and the neutron EDM from all the Barr-Zee type diagrams. We then examine the parameter space allowed by the constraints mentioned above and also those from the uniqueness of the vacuum, measurements at Tevatron and LHC by using HEPfit to perform a global parameter fit. We find that the decays of the two lightest extra neutral (singly-charged) scalars, H1 and $$ {H}_2\left({H}_1^{\pm}\right) $$ H 2 H 1 ± , into hZ (WZ) can be significant at the same time under the constraints, which can serve as direct evidence of CP violation in our model, but not from models with multi-doublet extensions.

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Section: Jhep06(2023)069mentioning

confidence: 93%

CP violation in a model with Higgs triplets

Chen

Chiang

Yagyu

2023

J. High Energ. Phys.

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“…By computing the effective scalar potential, we find the range of Higgs portal coupling where eligible first-order EWPT can happen for different types of scalar leptoquark with a mass around TeV scale. Then we apply the standard procedure [39][40][41][42][43][44][45][46][47] to calculate the gravitational wave background produced during the first-order EWPT induced by leptoquark for some benchmark cases and compare it with the detector sensitivities. We…”

Section: Introductionmentioning

confidence: 99%

Gravitational wave signals from leptoquark-induced first-order electroweak phase transitions

King

2023

J. Cosmol. Astropart. Phys.

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We consider the extension of the Standard Model (SM) with scalar leptoquarks in SU(2) singlet, doublet and triplet representations. Through the coupling between leptoquark and the SM Higgs field, the electroweak phase transition (EWPT) can turn into first-order and consequently produce gravitational wave signals. We compute the required value of the leptoquark-Higgs for first-order EWPT to happen and discuss about the possible constraint from Higgs phenomenology. Choosing some benchmarks, we present the strength of the gravitational waves produced during the leptoquark-induced first-order EWPT and compare them to detector sensitivities. We find that the SU(2) representations of the leptoquark can be distinguished by gravitational waves in the parameter space where first-order EWPT can happen as a function of the Higgs portal coupling.

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“…ρ = 1 [6]. The constraints on the parameter space of the model is already well studied in the literature [7][8][9][10][11][12][13][14][15] and also a calculator is available [16] to calculate all the constraints. Various phenomenological works [17][18][19][20][21][22][23][24][25][26][27][28][29] on this model enrich the knowledge of the reader.…”

Section: Introductionmentioning

confidence: 99%

Charged Higgs boson searches in the Georgi-Machacek model at the LHC

Ghosh

Saha

2020

Phys. Rev. D

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The Georgi-Machacek Model allows for a large triplet vacuum expectation value (vev) with a custodial symmetric scalar potential. This manifestly leads to large charged Higgs coupling to SM fermions thus enhancing the detection probability of the model at the hadron collider. We show that the latest bound from LHC searches on charged Higgs scalar decaying to top and bottom quark restricts the triplet vev from above. We demonstrate that the combined limit from theoretical constraints and the latest Higgs data together with this charged Higgs bound can already curb the model parameter space significantly. Further, we propose the charged Higgs decaying to W ± boson and a SM-like Higgs as a prospective channel to probe the yet unbounded model parameter space at the future run of the LHC.

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Updated constraints on the Georgi-Machacek model and its electroweak phase transition and associated gravitational waves

Cited by 8 publications

References 152 publications

CP violation in a model with Higgs triplets

CP violation in a model with Higgs triplets

Gravitational wave signals from leptoquark-induced first-order electroweak phase transitions

Charged Higgs boson searches in the Georgi-Machacek model at the LHC

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