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Unitarity constraints on ALP interactions

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arxiv 2106.05977 v2 pith:HR4JFHW6 submitted 2021-06-10 hep-ph

I. Brivio , O. J. P. Éboli , M. C. Gonzalez-Garcia This is my paper
classification hep-ph
keywords bosonsconstraintsgaugeinteractionsscatteringunitarityallowedamplitudes
verification ladder T0 review T1 audit T2 compute T3 formal
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abstract

We derive partial-wave unitarity constraints on gauge-invariant interactions of an Axion-Like Particle (ALP) up to dimension-6 from all allowed $2\to2$ scattering processes in the limit of large center-of-mass energy. We find that the strongest bounds stem from scattering amplitudes with one external ALP and only apply to the coupling to a pair of $SU(2)_L$ gauge bosons. Couplings to $U(1)_Y$ and $SU(3)_C$ gauge bosons and to fermions are more loosely constrained.

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Cited by 3 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score.

  1. ALP pair production at the LHC

    hep-ph 2026-07 conditional novelty 6.0 of 10

    Non-resonant gg→aa→4γ production could constrain the dimension-6 ALP-gluon coupling down to ~10^-3 TeV^-2 at 300 fb^-1, but the allowed parameter space remains unbounded along multiple flat directions.

  2. Positivity and partial wave unitarity bounds on ALP theories via amplitude methods

    hep-ph 2025-10 conditional novelty 6.0 of 10

    Complete partial-wave unitarity and positivity bounds are derived for ALP effective interactions up to dimension 8, with new SMEFT positivity constraints as a byproduct.

  3. Quantum Gravity Cutoff from Axions: A Type IIB Landscape Study

    hep-th 2026-06 unverdicted novelty 5.0 of 10

    The bound Λ_QG ≲ 2π √S f holds for C2 and C4 axions in Type IIB Calabi-Yau compactifications even near Kähler moduli space boundaries where co-scaling fails.

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