Unitarity constraints on ALP interactions
High Energy Physics - Phenomenology
2021-09-27 v2
Abstract
We derive partial-wave unitarity constraints on gauge-invariant interactions of an Axion-Like Particle (ALP) up to dimension-6 from all allowed 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 gauge bosons. Couplings to and gauge bosons and to fermions are more loosely constrained.
Cite
@article{arxiv.2106.05977,
title = {Unitarity constraints on ALP interactions},
author = {I. Brivio and O. J. P. Éboli and M. C. Gonzalez-Garcia},
journal= {arXiv preprint arXiv:2106.05977},
year = {2021}
}
Comments
11 pages, 1 figure, 5 tables. Version published in PRD