Natural axion model from flavour

Chuliá, Salvador Centelles; Döring, Christian; Rodejohann, Werner; Saldaña-Salazar, U. J.

doi:10.1007/jhep09(2020)137

Cited by 10 publications

(7 citation statements)

References 113 publications

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“…In[44], the fermion mass hierarchies and the strong CP problem with four Higgs doublets along with the PQ symmetry have been discussed 5. Notice that the same leptonic Lagrangian was obtained in the context of a gauged U (1) symmetry in[45].…”

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confidence: 84%

Flavored axion in the UV-complete Froggatt–Nielsen models

et al. 2021

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We propose UV-completions of Froggatt–Nielsen–Peccei–Quinn models of fermion masses and mixings with flavored axions, by incorporating heavy fields. Here, the U(1) Froggatt–Nielsen symmetry is identified with the Peccei–Quinn symmetry to solve the strong CP problem along with the mass hierarchies of the Standard Model fermions. We take into account leading order contributions to the fermion mass matrices giving rise to Nearest-Neighbour-Interaction structure in the quark sector and $$A_2$$ A 2 texture in the neutrino sector. A comprehensive numerical analysis has been performed for the fermion mass matrices. Subsequently, we investigate the resulting axion flavor violating couplings and the axion-photon coupling arising from the model.

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confidence: 84%

Flavored axion in the UV-complete Froggatt–Nielsen models

et al. 2021

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“…The solution to the strong CP problem could also be intimately related to the flavor problem of the SM [15,16]. This naturally leads to a flavored axion [17][18][19][20], although an axion with flavor-blind interactions is also possible [21]. Another popular ultralight scalar is the majoron, the Goldstone boson associated to the breaking of global lepton number [22][23][24][25].…”

Section: Jhep03(2021)240mentioning

confidence: 99%

Ultralight scalars in leptonic observables

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Vicente

2021

J. High Energ. Phys.

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Many new physics scenarios contain ultralight scalars, states which are either exactly massless or much lighter than any other massive particle in the model. Axions and majorons constitute well-motivated examples of this type of particle. In this work, we explore the phenomenology of these states in low-energy leptonic observables. After adopting a model independent approach that includes both scalar and pseudoscalar interactions, we briefly discuss the current limits on the diagonal couplings to charged leptons and consider processes in which the ultralight scalar ϕ is directly produced, such as μ → eϕ, or acts as a mediator, as in τ → μμμ. Contributions to the charged leptons magnetic and electric moments are studied as well.

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“…GeV. Other studies on the link between U(1) PQ symmetry and neutrino/flavour can be found in [49][50][51][52][53][54][55][56][57][58][59][60][61][62][63].…”

Section: The Axion and The Dirac Neutrinomentioning

confidence: 99%

A connection between flavour anomaly, neutrino mass, and axion

Baek

2020

J. High Energ. Phys.

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We propose a minimal model in which the flavour anomaly in the b → sμ+μ− transition is connected to the breaking of Peccei-Quinn (PQ) symmetry. The flavour anomaly is explained from new physics contribution by introducing one generation of heavy quark and heavy lepton which are vector-like under the standard model (SM) gauge group but charged under a local U(1)X group. They mix with the SM quarks and leptons, inducing flavour-changing Z′ couplings, which generates the b → sμ+μ− anomaly at tree level. On the other hand the new fermions are chiral under the global Peccei-Quinn(PQ) symmetry. The pseudo-Goldstone boson coming from the spontaneous breaking of the PQ symmetry becomes an axion, solving the strong CP problem and providing a cold dark matter candidate. The same symmetry prevents the right-handed neutrino from having a Majorana mass term. But the introduction of a neutrino-specific Higgs doublet allows neutrino to have Dirac mass term without fine-tuning problem. The model shows an interplay between axion, neutrino, dark matter, and flavour physics.

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Natural axion model from flavour

Cited by 10 publications

References 113 publications

Flavored axion in the UV-complete Froggatt–Nielsen models

Flavored axion in the UV-complete Froggatt–Nielsen models

Ultralight scalars in leptonic observables

A connection between flavour anomaly, neutrino mass, and axion

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