Supersizing axions with small size instantons

Laux, Julien; Yu, Felix

doi:10.1007/jhep11(2022)088

Cited by 12 publications

(6 citation statements)

References 67 publications

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“…Using the spurion argument (see Refs. [17,18]), we can now observe that below the scale of QCD confinement, instantons induce a periodic potential for the axion leading the axion field to acquire a tadpole offset that minimizes the overall vacuum energy and adjusts the Θ parameter to zero:…”

Section: The Strong Cp Problem In the Standard Model And The Axion So...mentioning

confidence: 94%

Primer on Axion Physics

2023

Annalen der Physik

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The canonical axion potential is reviewed, with an emphasis on the field theory underlying radial and angular modes of complex scalar fields. The explicit calculation of the instanton‐induced breaking of the Goldstone field direction necessary to derive the canonical axion mass and decay constant relation is presented. The primer is intended to serve an audience with elementary quantum field theory expertise.

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Section: The Strong Cp Problem In the Standard Model And The Axion So...mentioning

confidence: 94%

Primer on Axion Physics

2023

Annalen der Physik

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“…For an ALP, χ remains a free parameter, while a vanilla QCD axion has χ = χ QCD , although recent studies have demonstrated that χ can be enhanced by non-QCD sources and still preserve the axion solution to the strong CP problem [38][39][40][41]. As long as λ AB is sufficiently large, the basis rotation in eq.…”

Section: Jhep03(2023)078mentioning

confidence: 99%

“…Since we focus on the parameter space where the ALP mass m a > 1 MeV for which the canonical QCD axion is disfavored, we must keep the SM fermions and anomalons dynamical in loop functions. In particular, recent literature has emphasized the collider scale in context of high-quality axions, where the axion is buffered from UV effects and the topological susceptibility is enlarged [41,[78][79][80][81][82][83]. The expression for G aγγ , defined previously in eq.…”

Section: Constraints On Alpsmentioning

confidence: 99%

“…While the SM effective field theory (EFT) of axions and axion-like particles (ALPs) has been extensively discussed recently [22][23][24][25][26][27][28][29][30][31][32][33][34][35][36][37], the study of anomalous PQ breaking and the corresponding assumptions on the effective field theory are crucially important. As an example, models featuring nontrivial completions of the quantum chromodynamics (QCD) gauge symmetry can shift the viable axion mass range into the electroweak scale and heavier [38][39][40][41], marking a new regime for axion effective field theory.…”

Section: Introductionmentioning

confidence: 99%

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Axion couplings in gauged U(1)′ extensions of the Standard Model

Laux

2023

J. High Energ. Phys.

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We explore the effective theory of an axion in a gauged baryon number symmetry extension of the Standard Model (SM), where the axion is realized from a Dine-Fischler-Srednicki-Zhitnitsky (DFSZ) model construction. Integrating out the anomalons realizes a pattern of effective Wilson coefficients reflecting the factorization between the anomalous Peccei-Quinn and gauged baryon number symmetries. We construct and analyze the chiral transformation invariance of the axion effective theory, accounting for possible flavor-violating axion couplings. We calculate and study the unique phenomenology of the axion and Z′ boson, and we present the current collider limits on these particles in the $$ \left\{{m}_{Z^{\prime }},{g}_B\right\} $$ m Z ′ g B , {ma, Gaγγ}, and $$ \left\{{m}_a,{f}_a^{-1}\right\} $$ m a f a − 1 planes.

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“…Related work to solving the strong CP problem departing from the canonical band include Refs. [3][4][5][6][7][8][9][10][11]. Furthermore, the new parameter space corresponds to an almost perfect alignment between the soft breaking vacuum and the θ QCD vacuum.…”

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confidence: 93%

A Lighter QCD Axion from Anarchy

Elahi¹,

Elor²,

Laux³

et al. 2023

Preprint

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We introduce the Anarchic Axion, a class of axion models which solves the Strong CP problem with a lighter than usual QCD axion, thus populating new parameter space that ongoing and future experiments target. The Anarchic Axion is driven light by a soft breaking of the Peccei-Quinn symmetry, which also predicts a residual neutron electric dipole moment. We introduce a novel measure to quantify the tuning required for large deviations from the usual QCD axion band. In addition to motivating searches for unusually light axions, this work establishes a new target for axion effective field theory.The Peccei-Quinn (PQ) solution [1,2] to the Strong Charge-Parity (CP) problem of quantum chromodynamics (QCD) predicts relationships between the axion mass m a , decay constant f a and axion-photon coupling g aγγ . In this Letter, we introduce a new class of multi-scalar axion models -The Anarchic Axion -so dubbed as to emphasize that the PQ symmetry arises accidentally.

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Supersizing axions with small size instantons

Cited by 12 publications

References 67 publications

Primer on Axion Physics

Primer on Axion Physics

Axion couplings in gauged U(1)′ extensions of the Standard Model

A Lighter QCD Axion from Anarchy

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