ALP-Pions generalized
Triparno Bandyopadhyay, Subhajit Ghosh, Tuhin S. Roy

TL;DR
This paper explores how light axion-like particles (ALPs) influence standard meson decay processes, proposing data-driven methods to extract ALP effects and set indirect bounds using meson observables and lattice results.
Contribution
It introduces a generalized ALP-quark Lagrangian without parity restrictions and demonstrates how meson decay data can provide robust indirect bounds on ALP physics.
Findings
Derived bounds on ALP from $K^+_{\ell_3}$ decays using NA48/2 data
Identified sum rules indicating ALP presence and nature
Showed the impact of ALPs on meson mass relations and form factors
Abstract
A light axion-like particle or an ALP not just gives rise to interesting and spectacular signals of new physics as final states in meson decays, it necessarily leaves tell-tale signatures in processes that involve standard model (SM) fields only (i.e., SM processes). These effects result in the violation of the Gell-Mann--Okubo mass relation, modified form factors, altered integrated and differential rates for various SM transitions etc. This suggests that in the presence of a low lying state, such as an ALP, extraction of masses, mixing angles, and form factors in an entirely data-driven way from meson-physics observables is a highly non-trivial exercise. However, once done correctly, these same observables may, in turn, provide important (indirect) bounds on ALP physics, which remain robust even in the limits where new physics effects conspire to weaken the bounds from direct…
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Taxonomy
TopicsDark Matter and Cosmic Phenomena · Particle physics theoretical and experimental studies · Quantum Chromodynamics and Particle Interactions
