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Consistent treatment of axions in the weak chiral Lagrangian

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arxiv 2102.13112 v1 pith:WKBYW3CO submitted 2021-02-25 hep-ph

Martin Bauer (U. Durham) , Matthias Neubert (U. Mainz) , Sophie Renner (SISSA) , Marvin Schnubel (U. Mainz) , Andrea Thamm (U. Melbourne) This is my paper · ORCID
classification hep-ph
keywords chiralaxionconsistentdecayslagrangianweakalmostapplication
verification ladder T0 review T1 audit T2 compute T3 formal
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abstract

We present a consistent implementation of weak decays involving an axion or axion-like particle in the context of an effective chiral Lagrangian. We argue that previous treatments of such processes have used an incorrect representation of the flavor-changing quark currents in the chiral theory. As an application, we derive model-independent results for the decays $K^-\to\pi^- a$ and $\pi^-\to e^-\bar\nu_e a$ at leading order in the chiral expansion and for arbitrary axion couplings and mass. In particular, we find that the $K^-\to\pi^- a$ branching ratio is almost 40 times larger than previously estimated.

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Cited by 4 Pith papers

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    hep-ph 2025-07 conditional novelty 6.0 of 10

    Within a resonance chiral model, hadron resonances boost predicted tau decays into pion/K plus axion by factors of 7.5 and 19.2, with branching ratios and forward-backward asymmetries also predicted.

  3. New axion contribution to the two-photon decays of neutral pions

    hep-ph 2025-02 conditional novelty 5.0 of 10

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  4. Axions and Axion-like particles: collider searches

    hep-ph 2025-08 accept

    A pedagogical review of the ALP effective field theory, production and decay at colliders, indirect search strategies, and a summary of current bounds on the ALP-photon coupling.

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