We derive partial-wave unitarity constraints on gauge-invariant interactions of an axionlike particle up to dimension-6 from all allowed 2 → 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 axionlike particle 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.
Unitarity constraints on ALP interactions
Brivio, I.;
2021
Abstract
We derive partial-wave unitarity constraints on gauge-invariant interactions of an axionlike particle up to dimension-6 from all allowed 2 → 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 axionlike particle 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.File in questo prodotto:
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unitarityALP PhysRevD.104.035027.pdf
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