FN-2HDM: Two Higgs Doublet Models with Froggatt-Nielsen symmetry

Dery, Avital; Nir, Yosef

doi:10.1007/jhep04(2017)003

Cited by 8 publications

(8 citation statements)

References 51 publications

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“…The symmetry is explicitly broken by a small spurion field ϵ FN . The FN mechanism is effective in suppressing FCNC in MHDMs if the various Higgs doublets are also charged differently under U(1) FN [28]. Phenomenological constraints imply that in the two Higgs doublet models with a FN symmetry (2DHM-FN), ϵ FN ≲ 10 −3 is required.…”

Section: Jhep10(2023)078mentioning

confidence: 99%

The flavor of a light charged Higgs

Bernal,

Losada,

Nir

et al. 2023

J. High Energ. Phys.

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The ATLAS Collaboration has recently reported a search for light-charged Higgs in t → H+b decay, with $$ {H}^{+}\to c\overline{b} $$ H + → c b ¯ . An excess with a local significance of approximately 3σ is found at $$ {m}_{H^{+}} $$ m H + ≈ 130 GeV, with a best-fit value of BR(t → H+b) × BR($$ {H}^{+}\to c\overline{b} $$ H + → c b ¯ ) = (1.6 ± 0.6) × 10−3. We study the implications of such a hypothetical signal in multi-Higgs doublet models. We take into account constraints from searches for other charged Higgs decays and from flavor-changing neutral current processes. Two Higgs doublet models with flavor structure dictated by natural flavor conservation (NFC), minimal flavor violation (MFV), or the Froggatt-Nielsen (FN) mechanism cannot account for such excess. A three-Higgs doublet model with NFC can account for the signal. The Yukawa couplings of the neutral pseudoscalar A in the down sector, $$ {\hat{Y}}_A^D $$ Y ̂ A D , should be larger by a factor of 4 – 6 compared to the corresponding Yukawa couplings of the Higgs h, $$ {\hat{Y}}_h^D $$ Y ̂ h D . We further present two minimal scenarios, one in which a single Yukawa coupling in the down sector, $$ {\left({\hat{Y}}_A^D\right)}_{bb} $$ Y ̂ A D bb , gives the only significant contribution, and one in which two Yukawa couplings in the up sector, $$ {\left({\hat{Y}}_A^U\right)}_{tt} $$ Y ̂ A U tt and $$ {\left({\hat{Y}}_A^U\right)}_{tc} $$ Y ̂ A U tc , give the only significant contributions, and we discuss possible tests of these scenarios.

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Section: Jhep10(2023)078mentioning

confidence: 99%

The flavor of a light charged Higgs

Bernal,

Losada,

Nir

et al. 2023

J. High Energ. Phys.

Self Cite

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“…(2.6) does not assume couplings to φ or φ † only: such a UV restriction would be a typical outcome of supersymmetric extensions of the SM due to the holomorphic property of the superpotential [48,49]; a supersymmetric version of eq. (2.7) would also need a second Higgs doublet at work, implying a dedicated inspection of the role of the misalignement between the VEV of the two Higgs fields in the analysis of the flavour puzzle [75][76][77]. In our study we do not consider this class of models, that would offer a generalization of eq.…”

Section: Jhep03(2021)135mentioning

confidence: 99%

Minimal Froggatt-Nielsen textures

Fedele

Alessio

Valli

2021

J. High Energ. Phys.

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The flavour problem of the Standard Model can be addressed through the Froggatt-Nielsen (FN) mechanism. In this work, we develop an approach to the study of FN textures building a direct link between FN-charge assignments and the measured masses and mixing angles via unitary transformations in flavour space. We specifically focus on the quark sector to identify the most economic FN models able to provide a dynamical and natural understanding of the flavour puzzle. Remarkably, we find viable FN textures, involving charges under the horizontal symmetry that do not exceed one in absolute value (in units of the flavon charge). Within our approach, we also explore the degree of tuning of FN models in solving the flavour problem via a measure analogous to the Barbieri-Giudice one. We find that most of the solutions do not involve peculiar cancellations in flavour space.

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“…where H1 ≡ iσ 2 H * 1 as usual, and the charges n u,d,e are a combination of the U (1) charges of H 1 , (H 1 H 2 ) and the different SM fermion fields (for an alternative discussion, where H 1 , H 2 carry flavour charges, but the Yukawa interactions are taken to be renormalizable, see [1417]). For simplicity, we set the flavour charges of H 1 and H 2 to 0 and 1, respectively, such that n u ij = a q i − a u j , n d ij = −a q i + a d j , if we denote by a q i , a u i , .…”

Section: Low Scale Gauge Flavour Symmetriesmentioning

confidence: 99%

Opportunities in Flavour Physics at the HL-LHC and HE-LHC

Cerri,

Gligorov,

Malvezzi

et al. 2018

Preprint

117

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Motivated by the success of the flavour physics programme carried out over the last decade at the Large Hadron Collider (LHC), we characterize in detail the physics potential of its High-Luminosity and High-Energy upgrades in this domain of physics. We document the extraordinary breadth of the HL/HE-LHC programme enabled by a putative Upgrade II of the dedicated flavour physics experiment LHCb and the evolution of the established flavour physics role of the ATLAS and CMS general purpose experiments. We connect the dedicated flavour physics programme to studies of the top quark, Higgs boson, and direct high-p T searches for new particles and force carriers. We discuss the complementarity of their discovery potential for physics beyond the Standard Model, affirming the necessity to fully exploit the LHC's flavour physics potential throughout its upgrade eras.

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FN-2HDM: Two Higgs Doublet Models with Froggatt-Nielsen symmetry

Cited by 8 publications

References 51 publications

The flavor of a light charged Higgs

The flavor of a light charged Higgs

Minimal Froggatt-Nielsen textures

Opportunities in Flavour Physics at the HL-LHC and HE-LHC

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