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arXiv · 2311.12158

The Chiral Lagrangian of CP-Violating Axion-Like Particles

Luca Di Luzio·Gabriele Levati·Paride Paradisi
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Abstract

We discuss the construction of the most general CP-violating chiral Lagrangian for an axion-like particle (ALP). Starting with an effective Lagrangian containing light quarks and gluons, we provide its matching onto a chiral effective Lagrangian at $\mathcal{O}(p^2)$ described in terms of mesons and baryons, identifying the correspondence between the Jarlskog invariants of the two theories. After deriving the ALP interactions with mesons and baryons, we analyse a few relevant phenomenological implications such as the permanent electric dipole moments of nucleons and the CP-violating ALP and kaon decays.This work provides the necessary tools for further phenomenological analyses connecting low-energy observables with the couplings of the underlying ultraviolet complete theory.

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Luca Di Luzio, Gabriele Levati, Paride Paradisi. 2023-11-20. The Chiral Lagrangian of CP-Violating Axion-Like Particles. https://doi.org/10.1007/jhep02(2024)020

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