Unitarity constraints on ALP interactions

I. Brivio; O. J.P. Éboli; M. C. González-García

doi:10.1103/PhysRevD.104.035027

Unitarity constraints on ALP interactions

I. Brivio
, O. J.P. Éboli
, M. C. González-García

Institute for Theoretical Physics

Heidelberg University
Universidade de São Paulo

Research output: Contribution to journal › Article › peer-review

15 Scopus citations

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.

Original language	English
Article number	035027
Journal	Physical Review D
Volume	104
Issue number	3
DOIs	https://doi.org/10.1103/PhysRevD.104.035027
State	Published - Aug 1 2021

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10.1103/PhysRevD.104.035027

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title = "Unitarity constraints on ALP interactions",

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.",

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AB - 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.

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Unitarity constraints on ALP interactions

Abstract

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