Minimal axion model from flavor

The solution to the Strong CP problem is analysed within the Minimal Flavour Violation (MFV) context. An Abelian factor of the complete flavour symmetry of the fermionic kinetic terms may play the role of the Peccei-Quinn symmetry in traditional axion models. Its spontaneous breaking, due to the addition of a complex scalar field to the Standard Model scalar spectrum, generates the MFV axion, which may redefine away the QCD theta parameter. It differs from the traditional QCD axion for its couplings that are governed by the fermion charges under the axial Abelian symmetry. It is also distinct from the so-called Axiflavon, as the MFV axion does not describe flavour violation, while it does induce flavour non-universality effects. The MFV axion phenomenology is discussed considering astrophysical, collider and flavour data.

Section: Jhep10(2017)168mentioning

confidence: 99%

Section: Jhep10(2017)168mentioning

confidence: 99%

The minimal flavour violating axion

Arias-Aragón

Merlo

2017

“…and Z F 4 invariant conditions in the Yukawa couplings are shown as 4 . The small hierarchies between neutrino masses are explained with a choice of O(1) Yukawa couplings since a neutrino mass squared is proportional to fourth power of the Yukawa couplings.…”

Section: An Example: N = 4 Casementioning

confidence: 99%

“…A discrete symmetry Z F N allows a self-coupling of the flavon in the superpotential, W S N /Λ N −3 , and the coupling stabilizes flavon. 4 This model also provides a solution for the µ-problem in the MSSM. The Higgsino mass term in the superpotential, the so-called µ-parameter, is written by W (S m /Λ m−1 )H u H d .…”

Section: Introductionmentioning

confidence: 99%

A low-scale flavon model with a ℤN symmetry

Higaki

Kawamura

2020

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].

“…They rely on an extended scalar and fermionic heavy sector and on an additional spontaneously broken symmetry. Their study has recently been revived by the focus on flavourful axions which arise in FN-like setups [5][6][7][8] and whose EFT is very much constrained by flavour physics [9][10][11]. Such flavourful axions can also be linked with dark matter studies [12].…”

Section: Introductionmentioning

confidence: 99%

Chiral Froggatt-Nielsen models, gauge anomalies and flavourful axions

Bonnefoy

Dudas

Pokorski

2020

We study UV-complete Froggatt-Nielsen-like models for the generation of mass and mixing hierarchies, assuming that the integrated heavy fields are chiral with respect to an abelian Froggatt-Nielsen symmetry. It modifies the mixed anomalies with respect to the Standard Model gauge group, which opens up the possibility to gauge the Froggatt-Nielsen symmetry without the need to introduce additional spectator fermions, while keeping mass matrices usually associated to anomalous flavour symmetries. We give specific examples where this happens, and we study the flavourful axion which arises from an accidental Peccei-Quinn symmetry in some of those models. Such an axion is typically more coupled to matter than in models with spectator fermions. * quentin.bonnefoy@desy.de †