Phenomenology of axion-meson mixing and scattering processes
Abstract
We study the mixing between a generic axion-like particle (ALP) and the light pseudoscalar mesons within chiral perturbation theory (χPT), and its consequences for low-energy scattering and decay processes. Starting from the most general ALP effective Lagrangian, we derive the ALP-meson kinetic and mass mixing induced at leading order in the ALP decay constant and isospin breaking for arbitrary ALP masses. As a result, we obtain the physical ALP mass to 𝒪(F2/fa2), recovering the QCD-axion limit and finding that any ALP with a vanishing bare mass shares the QCD-axion mass. We provide a compact parameterization of every four-body amplitude involving pseudoscalar mesons and an arbitrary number of ALPs. As an illustration, we show the KK̅→ P0a scattering. The framework applies for general ALP masses and couplings and consistently incorporates isospin breaking, essential for otherwise forbidden processes.
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BibTeX
@misc{duartegonzalez2026phenomenology,
title = {{Phenomenology of axion-meson mixing and scattering processes}},
author = {Noé Duarte-González},
howpublished = {arXiv},
year = {2026},
month = oct,
doi = {10.48550/arxiv.2610.10084},
eprint = {2610.10084},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2610.10084},
note = {CC BY 4.0},
}
RIS
TY - UNPB
TI - Phenomenology of axion-meson mixing and scattering processes
AU - Noé Duarte-González
PY - 2026
DA - 2026/10/07
PB - arXiv
DO - 10.48550/arxiv.2610.10084
UR - https://arxiv.org/abs/2610.10084
AB - We study the mixing between a generic axion-like particle (ALP) and the light pseudoscalar mesons within chiral perturbation theory (χPT), and its consequences for low-energy scattering and decay processes. Starting from the most general ALP effective Lagrangian, we derive the ALP-meson kinetic and mass mixing induced at leading order in the ALP decay constant and isospin breaking for arbitrary ALP masses. As a result, we obtain the physical ALP mass to 𝒪(F^2/f_a^2), recovering the QCD-axion limit and finding that any ALP with a vanishing bare mass shares the QCD-axion mass. We provide a compact parameterization of every four-body amplitude involving pseudoscalar mesons and an arbitrary number of ALPs. As an illustration, we show the KK̅→ P^0a scattering. The framework applies for general ALP masses and couplings and consistently incorporates isospin breaking, essential for otherwise forbidden processes.
ER -