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Consistent Treatment of Axions in the Weak Chiral Lagrangian

Bauer, Martin; Neubert, Matthias; Renner, Sophie; Schnubel, Marvin; Thamm, Andrea

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Authors

Matthias Neubert

Sophie Renner

Marvin Schnubel

Andrea Thamm



Abstract

We present a consistent implementation of weak decays involving an axion or axionlike 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− → π−a and π− → e−ν¯ea at leading order in the chiral expansion and for arbitrary axion couplings and mass. In particular, we find that the K− → π−a branching ratio is almost 40 times larger than previously estimated.

Citation

Bauer, M., Neubert, M., Renner, S., Schnubel, M., & Thamm, A. (2021). Consistent Treatment of Axions in the Weak Chiral Lagrangian. Physical Review Letters, 127(8), https://doi.org/10.1103/physrevlett.127.081803

Journal Article Type Article
Acceptance Date Jul 20, 2021
Online Publication Date Aug 20, 2021
Publication Date 2021
Deposit Date Nov 23, 2021
Publicly Available Date Nov 23, 2021
Journal Physical Review Letters
Print ISSN 0031-9007
Electronic ISSN 1079-7114
Publisher American Physical Society
Peer Reviewed Peer Reviewed
Volume 127
Issue 8
DOI https://doi.org/10.1103/physrevlett.127.081803

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Publisher Licence URL
http://creativecommons.org/licenses/by/4.0/

Copyright Statement
Published by the American Physical Society under the terms of
the Creative Commons Attribution 4.0 International license.
Further distribution of this work must maintain attribution to
the author(s) and the published article’s title, journal citation,
and DOI. Funded by SCOAP3.





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