A holographic perspective on the axion quality problem

Cox, Peter; Gherghetta, Tony; Nguyen, Minh D.

doi:10.1007/jhep01(2020)188

Cited by 38 publications

(50 citation statements)

References 44 publications

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“…Some mechanism should maintain the quality of the global PQ symmetry to be extremely good to solve the strong CP problem. This problem is not unique to the QCD axion but is also common to other solution to the QCD CP problem [44] and other mechanisms that strongly rely on precise global symmetries [45][46][47].…”

Section: Jhep08(2020)110mentioning

confidence: 96%

KOTO vs. NA62 dark scalar searches

Gori

Pérez

Tobioka

2020

J. High Energ. Phys.

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The two kaon factories, KOTO and NA62, are at the cutting edge of the intensity frontier, with an unprecedented numbers of long lived and charged Kaons, ∼ 10 13 , being measured and analyzed. These experiments have currently a unique opportunity to search for dark sectors. In this paper, we demonstrate that searches done at KOTO and NA62 are complementary, both probing uncharted territories. We consider two qualitatively different physics cases. In the first, we analyze models of axion-like-particles (ALP) which couple to gluons or electroweak gauge bosons. In the second, we introduce a model based on an approximate strange flavor symmetry that leads to a strong violation of the Grossman-Nir bound. For the first scenario, we design a new search strategy for the KOTO experiment, K L → π 0 a → 4γ. Its expected sensitivity on the branching ratio is at the level of 10 −9. This demonstrates the great potential of KOTO as a discovery machine. In addition, we revisit other bounds on ALPs from Kaon factories, highlighting the main sources of theoretical uncertainty, and collider experiments, and show new projections. For the second scenario, we show that the model may be compatible with the preliminary analysis of the KOTO-data that shows a hint for New Physics.

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Section: Jhep08(2020)110mentioning

confidence: 96%

KOTO vs. NA62 dark scalar searches

Gori

Pérez

Tobioka

2020

J. High Energ. Phys.

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“…Using a slice of AdS 5 [13], the axion-quality problem was recently addressed in ref. [14]. This was achieved by promoting the U(1) PQ global symmetry to a local gauge symmetry in the 5D bulk.…”

Section: Jhep04(2021)084mentioning

confidence: 99%

“…In this work, we extend the model considered in ref. [14], containing a PQ-charged, bulk complex scalar field, to also include bulk Standard Model fermions. The Higgs sector, consisting of two Higgs doublets, can either be localized on the UV boundary or propagate in the bulk.…”

Section: Jhep04(2021)084mentioning

confidence: 99%

Flavoured warped axion

Bonnefoy

Cox

Dudas

et al. 2021

J. High Energ. Phys.

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We consider a 5D extension of the DFSZ axion model that addresses both the axion quality and fermion mass hierarchy problems, and predicts flavour-dependent, off-diagonal axion-fermion couplings. The axion is part of a 5D complex scalar field charged under a U(1)PQ symmetry that is spontaneously broken in the bulk, and is insensitive to explicit PQ breaking on the UV boundary. Bulk Standard Model fermions interact with two Higgs doublets that can be localized on the UV boundary or propagate in the bulk to explain the fermion masses and mixings. When the Higgs doublets are localized on the UV boundary, they induce flavour diagonal couplings between the fermions and the axion. However, when the Higgs doublets propagate in the bulk, the overlap of the axion and fermion profiles generates flavour off-diagonal couplings. The effective scale of these off-diagonal couplings in both the quark and lepton sectors can be as small as 1011 GeV, and therefore will be probed in future precision flavour experiments.

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“…Estimations of their size from nonperturbative arguments via wormhole effects [32] fall too short of their required value. Conversely, their size from Planck-suppressed effective operators [33] would point to too large a mass, although several possibilities have been discussed that would prevent the lower dimension operators from being generated [34][35][36][37][38][39][40][41]. These options were originally introduced as a solution to the axion quality problem.…”

Section: The Majoron Mechanismmentioning

confidence: 99%

Neutrino masses and Hubble tension via a Majoron in MFV

et al. 2021

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The recent tension between local and early measurements of the Hubble constant can be explained in a particle physics context. A mechanism is presented where this tension is alleviated due to the presence of a Majoron, arising from the spontaneous breaking of Lepton Number. The lightness of the active neutrinos is consistently explained. Moreover, this mechanism is shown to be embeddable in the minimal (Lepton) flavour violating context, providing a correct description of fermion masses and mixings, and protecting the flavour sector from large deviations from the Standard Model predictions. A QCD axion is also present to solve the Strong CP problem. The Lepton Number and the Peccei–Quinn symmetries naturally arise in the minimal (Lepton) flavour violating setup and their spontaneous breaking is due to the presence of two extra scalar singlets. The Majoron phenomenology is also studied in detail. Decays of the heavy neutrinos and the invisible Higgs decay provide the strongest constraints in the model parameter space.

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A holographic perspective on the axion quality problem

Cited by 38 publications

References 44 publications

KOTO vs. NA62 dark scalar searches

KOTO vs. NA62 dark scalar searches

Flavoured warped axion

Neutrino masses and Hubble tension via a Majoron in MFV

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