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.
Brivio, I., \'Eboli, O.J.P., Gonzalez-Garcia, M.C. (2021). Unitarity constraints on ALP interactions. PHYSICAL REVIEW D, 104(3), 1-11 [10.1103/PhysRevD.104.035027].
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 | Dimensione | Formato | |
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unitarityALP PhysRevD.104.035027.pdf
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