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

Unitarity constraints on ALP interactions

I. Brivio , O. J. P. \'Eboli , M. C. Gonzalez-Garcia This is my paper

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classification hep-ph
keywords bosonsconstraintsgaugeinteractionsscatteringunitarityallowedamplitudes
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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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