The minimal flavour violating axion

Arias-Aragón, Fernando; Merlo, Luca

doi:10.1007/jhep10(2017)168

Cited by 60 publications

(49 citation statements)

References 252 publications

(282 reference statements)

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“…(ii ) We address the strong CP problem by promoting an Abelian factor that is required in the model from a Z 3 symmetry to an anomalous U(1) symmetry. This leads to a flavorful axion [12] (also called a flaxion [13], or axi-flavon [14][15][16], in the literature), which leads to more stringent lower bounds on the flavor scale M F than in our previous study (as well as new avenues for discovery). The possibility of flavored axions due to a continuous Abelian factor in a T ′ flavor model was considered in a supersymmetric model in Ref.…”

Section: Introductionmentioning

confidence: 77%

“…In this subsection, we verify that the Yukawa textures in Eqs. (2.2)-(2.4) reproduce the correct masses and mixing angles for the charged fermions, by performing a global fit that takes into account running from a high scale (which we will take to be 4 × 10 16 GeV, to be consistent with our later discussion of the neutrino sector) down to the weak scale. This is the same analysis that was performed in Ref.…”

Section: B Fit To Quarks and Charged Leptonsmentioning

confidence: 99%

“…The value of the quantity χ 2 defined in the text is 12.3. Running from the flavor scale M F down to the Z mass is taken into account, with M F = 4 × 1016 GeV, (see Sec. IV) chosen for the purpose of illustration.Best Fit Parameters ǫ = 2.42 × 10 −2 , ǫ ′ = 9.75 × 10 −5 , ρ = −1.38 × 10 −2 and its spontaneous breaking leads to a flavorful axion.…”

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confidence: 99%

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Flavor from the double tetrahedral group without supersymmetry: Flavorful axions and neutrinos

Carone

Merchand

2019

Phys. Rev. D

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We extend the work of Carone, Chaurasia and Vasquez on non-supersymmetric models of flavor based on the double tetrahedral group. Three issues are addressed: (1) the sector of flavorsymmetry-breaking fields is simplified and their potential studied explicitly, (2) a flavorful axion is introduced to solve the strong CP problem and (3) the model is extended to include the neutrino sector. We show how the model can accommodate the strong hierarchies manifest in the charged fermion Yukawa matrices, while predicting a qualitatively different form for the light neutrino mass matrix that is consistent with observed neutrino mass squared differences and mixing angles.The structure of the fermion Yukawa couplings in the standard model may result from the sequential breaking of a horizontal discrete family symmetry. Long ago, Aranda, Carone and Lebed [1, 2] showed how the double tetrahedral group T ′ could be used to construct successful supersymmetric flavor models that are similar to those based on U(2) symmetry [3,4], with or without the assumption of conventional supersymmetric grand unification. For other early work on T ′ as a flavor symmetry, see Ref. [5]. Many other authors have since explored the use of T ′ symmetry in models that aim to address the flavor structure of the standard model [6].Much of the work on T ′ flavor models has assumed weak-scale supersymmetry, to stabilize the hierarchy between the weak scale and the grand unified or Planck scale. Over the past decade, however, there has been no direct evidence for superpartners at the LHC, nor indirect evidence in the form of a convincing pattern of deviations from the predictions of the standard model for some subset of its observables. While one cannot exclude the possibility that supersymmetry is present and just beyond the reach of current experiments (a statement that applies to any new physics that has a decoupling limit), the current state of affairs has motivated a greater open-mindedness towards consideration of non-supersymmetric extensions of the standard model. For example, the possibility that the standard model could arise consistently from a string theory without supersymmetry has been discussed in Ref. [7].The hierarchies between mass scales might result from dynamical mechanisms (for example, cosmic relaxation [8] or Nnaturalness [9]), or anthropic selection [10]. On the other hand, the fundamental mass scales found in nature may simply be random and fine tuned, for reasons that are obscure to us at present. In this work, we assume the absence of supersymmetry and focus on phenomenological issues, while remaining agnostic on the question of naturalness.The purpose of the present work is to further explore the possibility of nonsupersymmetric models of flavor based on T ′ symmetry, following a study by Carone, Chaurasia and Vasquez [11]. In Ref. [11], a nonsupersymmetric T ′ model was presented in which the flavor scale M F was treated as a free parameter. (There is less motivation to link the flavor scale to a grand unified scale in a frame...

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Section: Introductionmentioning

confidence: 77%

Section: B Fit To Quarks and Charged Leptonsmentioning

confidence: 99%

mentioning

confidence: 99%

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Flavor from the double tetrahedral group without supersymmetry: Flavorful axions and neutrinos

Carone

Merchand

2019

Phys. Rev. D

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“…The result is not changed by sub-leading terms suppressed by (S/Λ)5 which may potentially exist in the superpotential.…”

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confidence: 87%

“…For a U (1) F gauge symmetry, D-term potential will stabilize the flavon VEV. For a global U (1) F , flavon VEV may be stabilized by similar ways as in (fl)axion models 5. See for reviews[44,45], and also Ref [46]…”

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confidence: 95%

A low-scale flavon model with a ℤN symmetry

Higaki

Kawamura

2020

J. High Energ. Phys.

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We propose a model that explains the fermion mass hierarchy by the Froggatt-Nielsen mechanism with a discrete Z F N symmetry. As a concrete model, we study a supersymmetric model with a single flavon coupled to the minimal supersymmetric Standard Model. Flavon develops a TeV scale vacuum expectation value for realizing flavor hierarchy, an appropriate µ-term and the electroweak scale, hence the model has a low cutoff scale. We demonstrate how the flavon is successfully stabilized together with the Higgs bosons in the model. The discrete flavor symmetry Z F N controls not only the Standard Model fermion masses, but also the Higgs potential and a mass of the Higgsino which is a good candidate for dark matter. The hierarchy in the Higgs-flavon sector is determined in order to make the model anomaly-free and realize a stable electroweak vacuum. We show that this model can explain the fermion mass hierarchy, realistic Higgs-flavon potential and thermally produced dark matter at the same time. We discuss flavor violating processes induced by the light flavon which would be detected in future experiments. N sym-1 Recently, it is proposed that a flavon can be identified as the QCD axion [3-8] 2 See, e.g., Refs. [35,36] for recent models with a flavor modular symmetry and also for such interactions in string models.3 Models with a combination of Higgs doublets H u H d as a flavon are studied in Refs. [41][42][43].

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Probing HNL‐ALP Couplings at Colliders

Giorgi

Merlo

Tastet

2023

Fortschritte der Physik

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Axion‐like particles (ALPs) and heavy neutral leptons (HNLs) are both well‐motivated extensions of the Standard Model. As ALPs couple to on‐shell fermions proportionally to their masses, processes involving both types of particles may give rise, for TeV HNLs, to relevant phenomenology at colliders. In this work, we point out a particularly clean process, whose final state consists of four jets and two charged leptons, and we estimate its current and future sensitivity at the LHC. For on‐shell HNLs, i) there is no dependence on the overall scale of the mixing between HNLs and the active neutrinos, making this process sensitive down to the type‐I Seesaw line; ii) the signal strength of the process is sizable only as far as the HNL masses are below a few TeVs, contrary to what the proportionality to masses of the ALP couplings may suggest. Although ALPs and HNLs have been mainly studied independently in the literature, considering their interplay may lead to joint limits that are much stronger than those on the individual particles taken separately. This concise study paves the way for similar searches at colliders and other experiments.

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The minimal flavour violating axion

Cited by 60 publications

References 252 publications

Flavor from the double tetrahedral group without supersymmetry: Flavorful axions and neutrinos

Flavor from the double tetrahedral group without supersymmetry: Flavorful axions and neutrinos

A low-scale flavon model with a ℤN symmetry

Probing HNL‐ALP Couplings at Colliders

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