Renormalization of the C2HDM with FeynMaster 2

Fontes, Duarte; Romão, Jorge C.

doi:10.1007/jhep06(2021)016

Cited by 12 publications

(4 citation statements)

References 97 publications

(241 reference statements)

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“…Refs. [51,[56][57][58][59][60] have discussed about this divergence via Fleischer-Jegerlehner tadpole scheme [61].…”

Section: Scalar Dark Sector Modelmentioning

confidence: 99%

Probing CP violation in dark sector through the electron electric dipole moment

Liu,

Nakai,

Shigekami

et al. 2024

J. High Energ. Phys.

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The Two Higgs Doublet Model (2HDM) stands as a promising framework for exploring physics beyond the Standard Model (SM). Within this context, we explore the possibility that the two Higgs doublets may serve as a window into CP-violating dark sectors, neutral under the SM gauge groups. Specifically, our focus is on investigating the electric dipole moment (EDM) of the electron, generated solely by CP violation in the dark sector. We present a general formula for the electron EDM, without specifying the structure of the dark sectors, and discuss the current constraints on various dark sector models. It is noteworthy that even in the case of a CP-conserving 2HDM, the resulting electron EDM is capable of reaching the current experimental limit, with CP violation arising exclusively from the dark sectors. Furthermore, we introduce a heavy dark sector (HDS) approximation for the analytic calculation of the EDM, assuming that the dark sector particles are much heavier than the physical states in the 2HDM. This approximation yields simplified analytic results that are consistent with the full numerical calculations.

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“…Refs. [51,[56][57][58][59][60] have discussed about this divergence via Fleischer-Jegerlehner tadpole scheme [61].…”

Section: Scalar Dark Sector Modelmentioning

confidence: 99%

Probing CP violation in dark sector through the electron electric dipole moment

Liu,

Nakai,

Shigekami

et al. 2024

J. High Energ. Phys.

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show abstract

“…( 2) we see that the first two can be obtained form the last by setting some or all of the couplings λ ij to zero. To get all the necessary couplings we implemented the case Z 2 × Z 2 in FeynMaster [14,15], the others follow from the argument above.…”

Section: Setup Of the Models: Scalar Sectormentioning

confidence: 99%

BFB conditions on a class of symmetry constrained 3HDM

Boto,

Romão,

Silva

2022

Preprint

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We study the bounded from below (BFB) conditions on a class of three Higgs doublet models (3HDM) constrained by the symmetry groups U (1) × U (1), U (1) × Z 2 , and Z 2 × Z 2 . These constraints must be implemented on both the neutral (BFB-n) and charged (BFB-c) directions.The exact necessary and sufficient BFB conditions are unknown in the Z 2 ×Z 2 case. We develop a general strategy using lower bounds to find sufficient conditions for BFB-n and BFB-c and apply it to these symmetries. In addition, we investigate the concern that the use of safe sufficient conditions can ignore valid points which would yield distinct physical consequences. This is done by performing a full phenomenological simulation of the U (1) × U (1) and U (1) × Z 2 models, where exact necessary and sufficient BFB conditions are possible. We look specifically at the points allowed by exact solutions but precluded by safe lower bounds. We found no evidence of remarkable new effects, partly reassuring the use of the lower bounds we propose here, for those potentials where no exact necessary and sufficient BFB conditions are known.

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“…and the couplings C j and λ h j H + k H − k for this model are written in the appendix. They were derived with the help of the software FeynMaster [29,30], that uses QGRAF [31], FeynRules [32,33] and FeynCalc [34,35] in an integrated way.…”

Section: Lhc Constraintsmentioning

confidence: 99%

“…In our conventions these couplings include the i from the Feynman rules. These couplings were derived with the help of the software FeynMaster [29,30].…”

Section: Appendix A: Some Important Couplingsmentioning

confidence: 99%

Current bounds on the Type-Z $Z_3$ three Higgs doublet model

Boto,

Romão,

Silva

2021

Preprint

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Type-Z models, where charged leptons, up type quarks and down type quarks each couple to a different scalar, are only possible when there are three or more Higgs doublets. We consider the Type-Z three Higgs doublet model imposed by a softly broken Z 3 symmetry. We take into account all theoretical and experimental constraints, highlighting the importance of perturbative unitarity and bounded from below conditions that we develop here, and which have a strong impact on B → X s γ. Since there can be cancellations between the two charged Higgs in B → X s γ (and in h → γγ), the lower bounds obtained on the charged Higgs masses are alleviated. We also discuss in detail the important physical differences between exact alignment and approximate alignment.

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Renormalization of the C2HDM with FeynMaster 2

Cited by 12 publications

References 97 publications

Probing CP violation in dark sector through the electron electric dipole moment

Probing CP violation in dark sector through the electron electric dipole moment

BFB conditions on a class of symmetry constrained 3HDM

Current bounds on the Type-Z $Z_3$ three Higgs doublet model

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