Unitarity constraints on ALP interactions

Abstract

We derive partial-wave unitarity constraints on gauge-invariant interactions of an Axion-Like Particle (ALP) up to dimension-6 from all allowed $2\to 2$ 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.

arXiv comment11 pages, 1 figure, 5 tables. Version published in PRD

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Cited by in corpus (10)

• Nonresonant Searches for Axion-Like Particles in Vector Boson Scattering Processes at the LHC
• Searching for the axion-like particle at the EIC
• Axion-like ALPs
• The Inflated Chern-Simons Number in Spectator Chromo-Natural Inflation
• Aiming for Tops of ALPs with a Muon Collider
• ALPs, the on-shell way
• Prospects for detecting the couplings of axion-like particle with neutrinos at the CEPC
• Interplay of ALP Couplings at a Muon Collider
• Perturbative unitarity constraints on generic Yukawa interactions
• Positivity and partial wave unitarity bounds on ALP theories via amplitude methods