Composite accidental axions

Redi, Michele; Sato, Ryo

doi:10.1007/jhep05(2016)104

Cited by 71 publications

(68 citation statements)

References 51 publications

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“…(2.12). Of particular interest is that the ratio between the axion coupling to photons and that to gluons, which is typically a free parameter [122][123][124][125][126][127], is exactly fixed to 8/3, as in the original DFSZ invisible axion model.…”

Section: Jhep10(2017)168mentioning

confidence: 99%

The minimal flavour violating axion

Arias-Aragón

Merlo

2017

J. High Energ. Phys.

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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.

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Section: Jhep10(2017)168mentioning

confidence: 99%

The minimal flavour violating axion

Arias-Aragón

Merlo

2017

J. High Energ. Phys.

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“…Having extracted the VEVs of the mesons due to a finite θ-angle, we can also extract the (CP-violating) couplings of (non-derivative) vertices with three mesons. Up to corrections suppressed at large N c , these arise from the mass term After inserting the mixing with the axion in (2.12) and in (2.13) and the VEVs from (B.20) 40 we obtain that the three pion couplings are…”

Section: B1 Vevs Induced By Cp-odd Couplingsmentioning

confidence: 99%

“…In its most common realizations [34]- [40], [15], the composite axion is identified with a neutral pseudo-Goldstone boson of an extra, strongly coupled, confining gauge theory, whose dynamical scale Λ a determines the axion coupling f a . In these models the axion can be rendered "invisible" only if Λ a Λ QCD , [15].…”

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confidence: 99%

Non-derivative axionic couplings to nucleons at large and small N

Bigazzi

Cotrone

Järvinen

et al. 2020

J. High Energ. Phys.

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Among the possible CP-odd couplings of the axion to ordinary matter, the most relevant ones for phenomenology are the Yukawa couplings to nucleons. We analyze such non-derivative couplings within three complementary approaches: standard effective field theory, the Skyrme model and holographic QCD. In all the cases, the couplings can be related to the CP-odd non-derivative couplings to nucleons of the low-lying mesons and the η . Using the effective field theory approach we derive the expressions for the CP-odd interaction terms as functions of the parameters of the effective Lagrangian. Then, we compute the CP-odd couplings to nucleons of the axion, the η and the pseudo-Goldstone mesons in both the Skyrme and the holographic QCD model with N f = 2, 3 flavors. We relate the coefficients of the non-derivative axion-nucleon couplings to those of the derivative ones. The relations do not explicitly depend on model parameters. This allows us to provide quantitative estimates of these couplings. D. CP violating η -pion-pion coupling 56 E. Alternative numerical estimates of the couplings 57 Introduction and resultsThe Peccei-Quinn proposal [1] for a natural solution of the strong CP problem -the unnaturally small value of the QCD θ angle -implies the existence of a new light neutral pseudoscalar boson, the axion [2, 3]. The original theory, severely constrained by data, was not renormalizable because of the axion coupling to the QCD instanton density [4,5]. In renormalizable axion models, successively proposed in [6,7,8], the axions were also made very weakly interacting with ordinary matter, as required by experimental constraints. These "invisible axions", whose couplings to matter have been deduced using anomalies and the chiral Lagrangian [9]- [14], are nowadays considered among the most promising candidates as dark matter constituents, and also as possible realizations of the inflaton [15]- [20]. As of today, axion-like particles (ALPs) are ubiquitous and serve various purposes. The nomenclature has also evolved but still remains sometimes murky. Axions that solve the strong CP problem are typically called QCD axions. The term "axionlike particle" is often used to refer (only) to other types of axions.Generically, axions display a perturbative shift symmetry and couple to instanton densities. In any reliable quantum field theory (QFT) realization, the symmetry is broken (at best) to a discrete symmetry due to non-perturbative effects. Such effects, related to instantons in weakly-coupled models, induce a mass and, more generally, a potential term, for the QCD axion (see e.g. [13]).ALPs arise very commonly in string theory [21], the simplest example being the Ramond-Ramond (RR) axion of type IIB string theory. They can also arise, after compactification, from internal components of antisymmetric form gauge fields as well as from off-diagonal components of the metric. In these cases, ALPs are related to generalized gauge fields [22,23]. The corresponding gauge symmetries provide the perturbative Peccei-Quinn (PQ) sym...

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“…It will be shown that a satisfactory U (1) P Q symmetry is an automatic consequence of the chiral realization of the gauge group. Note that some models have been previously built for which PQ invariance is accidental, that is, not imposed by hand [50][51][52][53][54][55][56][57]. Nevertheless, they all required extra symmetries in addition to axicolor, either gauge or discrete ones.…”

Section: Introductionmentioning

confidence: 99%

“…Here, the Planck mass does not denote the reduced Planck scale but the one given by M Pl = G −1/2 with G being the Newton constant 3. They can be avoided, though, in some invisible axion constructions with a variety of extra assumptions or frameworks[50][51][52][53][54][55][56][57], or be arguably negligible in certain conditions[58]. It is also possible to avoid the dangerous terms in "heavy axion" models[18][19][20][21][22][23][24][25][26][27][28][29], as their fa scale can be very low, e.g.…”

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confidence: 99%

Automatic Peccei–Quinn symmetry

et al. 2019

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We present a dynamical (composite) axion model where the Peccei-Quinn (PQ) symmetry arises automatically as a consequence of chirality and gauge symmetry. The Standard Model is simply extended by a confining and chiral SU (5) gauge symmetry. The PQ symmetry coincides with a B − L symmetry of the exotic sector. The theory is protected by construction from quantum gravitational corrections stemming from operators with mass dimension lower than nine.

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Composite accidental axions

Cited by 71 publications

References 51 publications

The minimal flavour violating axion

The minimal flavour violating axion

Non-derivative axionic couplings to nucleons at large and small N

Automatic Peccei–Quinn symmetry

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