A low-scale flavon model with a ℤN symmetry

Higaki, Tetsutaro; Kawamura, Junichiro

doi:10.1007/jhep03(2020)129

Cited by 11 publications

(6 citation statements)

References 251 publications

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“…This would leave LFV decays as the main experimental signature to hunt for. Similarly, our updated LFV sensitivities will probe the parameter space of axion or relaxion models which try to address the flavor puzzle [36][37][38][39][40].…”

Section: Introductionmentioning

confidence: 99%

Looking forward to lepton-flavor-violating ALPs

Calibbi

Redigolo

Ziegler

et al. 2021

J. High Energ. Phys.

101

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We assess the status of past and future experiments on lepton flavor violating (LFV) muon and tau decays into a light, invisible, axion-like particle (ALP), a. We propose a new experimental setup for MEG II, the MEGII-fwd, with a forward calorimeter placed downstream from the muon stopping target. Searching for μ → ea decays MEGII-fwd is maximally sensitive to LFV ALPs, if these have nonzero couplings to right-handed leptons. The experimental set-up suppresses the (left-handed) Standard Model background in the forward direction by controlling the polarization purity of the muon beam. The reach of MEGII-fwd is compared with the present constraints, the reach of Mu3e and the Belle-II reach from τ → ℓa decays. We show that a dedicated experimental campaign for LFV muon decays into ALPs at MEG II and Mu3e will be able to probe the ALP parameter space in an unexplored region well beyond the existing astrophysical constraints. We study the implications of these searches for representative LFV ALP models, where the presence of a light ALP is motivated by neutrino masses, the strong CP problem and/or the SM flavor puzzle. To this extent we discuss the majoron in low-scale seesaw setups and introduce the LFV QCD axion, the LFV axiflavon and the leptonic familon, paying particular attention to the cases where the LFV ALPs constitute cold dark matter.

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Section: Introductionmentioning

confidence: 99%

Looking forward to lepton-flavor-violating ALPs

Calibbi

Redigolo

Ziegler

et al. 2021

J. High Energ. Phys.

101

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“…In this case φ 4 is the trivial singlet, and it looks like a flavon of the usual Z 4 flavor symmetric models. Such a flavon may be important for physics around the standard model [71]. The stringy origin of our model is also unclear and it should be investigated.…”

Section: Jhep07(2021)068mentioning

confidence: 99%

Modular origin of mass hierarchy: Froggatt-Nielsen like mechanism

Kuranaga

Ohki

Uemura

2021

J. High Energ. Phys.

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We study Froggatt-Nielsen (FN) like flavor models with modular symmetry. The FN mechanism is a convincing solution to the flavor puzzle in the quark sector. The FN mechanism requires an extra U(1) gauge symmetry which is broken at high energies. Alternatively, in the framework of modular symmetry the modular weights can play the role of the FN charges of the extra U(1) symmetry. Based on the FN-like mechanism with modular symmetry we present new flavor models for the quark sector. Assuming that the three generations have a common representation under the modular symmetry, our models simply reproduce the FN-like Yukawa matrices. We also show that the realistic mass hierarchy and mixing angles, which are related to each other through the modular parameters and a scalar vev, can be realized in models with several finite modular groups (and their double covering groups) without unnatural hierarchical parameters.

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“…[26], the LHC phenomenology is explored in Refs. [27][28][29][30][31][32][33][34], a low flavour breaking scale is studied in Ref. [35], a study for a future high energy collider is presented in Ref.…”

Section: Introductionmentioning

confidence: 99%

Flavour bounds on the flavon of a minimal and a non-minimal $${\mathcal {Z}}_2 \times {\mathcal {Z}}_N$$ symmetry

Abbas

Singh

et al. 2023

Eur. Phys. J. C

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We investigate flavour bounds on the $${\mathcal {Z}}_2 \times {\mathcal {Z}}_5$$ Z 2 × Z 5 and $${\mathcal {Z}}_2 \times {\mathcal {Z}}_9$$ Z 2 × Z 9 flavour symmetries. These flavour symmetries are a minimal and a non-minimal forms of the $${\mathcal {Z}}_2 \times {\mathcal {Z}}_N$$ Z 2 × Z N flavour symmetry, that can provide a simple set-up for the Froggatt–Nielsen mechanism. The $${\mathcal {Z}}_2 \times {\mathcal {Z}}_5$$ Z 2 × Z 5 and $${\mathcal {Z}}_2 \times {\mathcal {Z}}_9$$ Z 2 × Z 9 flavour symmetries are capable of explaining the fermionic masses and mixing pattern of the standard model including that of the neutrinos. The bounds on the parameter space of the flavon field of the $${\mathcal {Z}}_2 \times {\mathcal {Z}}_5$$ Z 2 × Z 5 and $${\mathcal {Z}}_2 \times {\mathcal {Z}}_9$$ Z 2 × Z 9 flavour symmetries are derived using the current quark and lepton flavour physics data and future projected sensitivities of quark and lepton flavour effects. The strongest bounds on the flavon of the $${\mathcal {Z}}_2 \times {\mathcal {Z}}_5$$ Z 2 × Z 5 symmetry come from the $$D^0 - {{\bar{D}}}^0$$ D 0 - D ¯ 0 mixing. The bounds on the $${\mathcal {Z}}_2 \times {\mathcal {Z}}_9$$ Z 2 × Z 9 flavour symmetry are stronger than that of the minimal $${\mathcal {Z}}_2 \times {\mathcal {Z}}_5$$ Z 2 × Z 5 symmetry. The ratio $$R_{\mu \mu }$$ R μ μ provides rather robust bounds on the flavon parameters in the future phase-I and phase-II of the LHCb by leaving only a very small region in the allowed parameter space of the models.

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A low-scale flavon model with a ℤN symmetry

Cited by 11 publications

References 251 publications

Looking forward to lepton-flavor-violating ALPs

Looking forward to lepton-flavor-violating ALPs

Modular origin of mass hierarchy: Froggatt-Nielsen like mechanism

Flavour bounds on the flavon of a minimal and a non-minimal $${\mathcal {Z}}_2 \times {\mathcal {Z}}_N$$ symmetry

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