Model of visible QCD axion

Fukuda, Hajime; Harigaya, Keisuke; Ibe, Masahiro; Yanagida, Tsutomu T.

doi:10.1103/physrevd.92.015021

Cited by 130 publications

(157 citation statements)

References 65 publications

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“…One of the axions or saxions in the model can explain the recently found diphoton excess in LHC [37][38][39][40]. 1 In addition, the required high quality of the PQ symmetry [44,45] can be naturally realized in this model [36].…”

Section: Jhep08(2016)044mentioning

confidence: 97%

Topological defects and nano-Hz gravitational waves in aligned axion models

Higaki

Jeong

Kitajima

et al. 2016

J. High Energ. Phys.

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We study the formation and evolution of topological defects in an aligned axion model with multiple Peccei-Quinn scalars, where the QCD axion is realized by a certain combination of the axions with decay constants much smaller than the conventional PecceiQuinn breaking scale. When the underlying U(1) symmetries are spontaneously broken, the aligned structure in the axion field space exhibits itself as a complicated string-wall network in the real space. We find that the string-wall network likely survives until the QCD phase transition if the number of the Peccei-Quinn scalars is greater than two. The stringwall system collapses during the QCD phase transition, producing a significant amount of gravitational waves in the nano-Hz range at present. The typical decay constant is constrained to be below O(100) TeV by the pulsar timing observations, and the constraint will be improved by a factor of 2 in the future SKA observations.

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Section: Jhep08(2016)044mentioning

confidence: 97%

Topological defects and nano-Hz gravitational waves in aligned axion models

Higaki

Jeong

Kitajima

et al. 2016

J. High Energ. Phys.

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“…Restricting the width to (a → γ γ ) and using the coupling strength g aγ γ as defined in Eq. (19), it follows that…”

Section: Assumptions and Validity Of The Eftmentioning

confidence: 99%

“…The magnitude of the couplings of axions to ordinary matter is inversely proportional to the scale of U (1) spontaneous symmetry breaking, which is much higher than the electroweak scale in the latter, "invisible", constructions. Lower axion scales are considered though in other implementations of the Peccei-Quinn solution to the strong CP problem [8][9][10][11][12][13][14][15][16][17][18][19][20][21][22].…”

Section: Introductionmentioning

confidence: 99%

ALPs effective field theory and collider signatures

et al. 2017

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We study the leading effective interactions between the Standard Model fields and a generic singlet CP-odd (pseudo-) Goldstone boson. Two possible frameworks for electroweak symmetry breaking are considered: linear and non-linear. For the latter case, the basis of leading effective operators is determined and compared with that for the linear expansion. Associated phenomenological signals at colliders are explored for both scenarios, deriving new bounds and analyzing future prospects, including LHC and High Luminosity LHC sensitivities. Mono-Z , mono-W , W -photon plus missing energy and on-shell top final states are most promising signals expected in both frameworks. In addition, non-standard Higgs decays and mono-Higgs signatures are especially prominent and expected to be dominant in non-linear realisations.

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“…Two other examples of non-supersymmetric Z 2 models -in which SU(3) c is also copied -are heavy axion models [18][19][20] and the heavy η ′ model of [21]. In both cases, the Z 2 requires the UVθ angles in the two sectors to match.…”

Section: Heavy Axion and η ′ Modelsmentioning

confidence: 99%

“…SU(3) c → SU(3) ′ c . In these theories, the generalized parity mechanism is not operative, butθ may be relaxed at the same time asθ ′ by a "heavy axion" [18][19][20] or a "heavy η ′ " [21].…”

Section: Jhep12(2015)046mentioning

confidence: 99%

Strong CP and SUZ2

Albaid

Dine

Draper

2015

J. High Energ. Phys.

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Solutions to the strong CP problem typically introduce new scales associated with the spontaneous breaking of symmetries. Absent any anthropic argument for small θ, these scales require stabilization against ultraviolet corrections. Supersymmetry offers a tempting stabilization mechanism, since it can solve the "big" electroweak hierarchy problem at the same time. One family of solutions to strong CP, including generalized parity models, heavy axion models, and heavy η ′ models, introduces Z 2 copies of (part of) the Standard Model and an associated scale of Z 2 -breaking. We review why, without additional structure such as supersymmetry, the Z 2 -breaking scale is unacceptably tuned. We then study "SUZ 2 " models, supersymmetric theories with Z 2 copies of the MSSM. We find that the addition of SUSY typically destroys the Z 2 protection ofθ = 0, even at tree level, once SUSY and Z 2 are broken. In theories like supersymmetric completions of the twin Higgs, where Z 2 addresses the little hierarchy problem but not strong CP, two axions can be used to relaxθ.

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Model of visible QCD axion

Cited by 130 publications

References 65 publications

Topological defects and nano-Hz gravitational waves in aligned axion models

Topological defects and nano-Hz gravitational waves in aligned axion models

ALPs effective field theory and collider signatures

Strong CP and SUZ2

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