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Hyperon nonleptonic decays in relativistic chiral perturbation theory with resonances

Nora Salone1,*, Fernando Alvarado2,†, Stefan Leupold3,‡, and Andrzej Kupsc3,4,§

  • *Contact author: nora.salone@us.edu.pl
  • †Contact author: f.alvarado@gsi.de
  • ‡Contact author: stefan.leupold@physics.uu.se
  • §Contact author: andrzej.kupsc@physics.uu.se
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Phys. Rev. D 114, 054051 – Published 28 September, 2026

DOI: https://doi.org/10.1103/bxb5-pbz6

Abstract

Motivated by recent experimental advances in the corresponding measurements, nonleptonic hyperon decays are calculated, for the first time in a relativistic manner, in chiral perturbation theory at next-to-leading order (NLO). On the one hand, relativistic loop corrections are computed explicitly based on the ground-state octet and decuplet fields. On the other hand, the NLO weak-transition low-energy constants are estimated by resonance saturation, inspired by the nonrelativistic tree-level computation of B. Borasoy and B. R. Holstein, [Phys. Rev. D 59, 094025 (1999)]. In particular, the 1/2− and the (excited) 1/2+ resonance octets are utilized. The remaining unknown parameters are fitted to the decay amplitudes. A good combined fit to both s- and p-wave amplitudes is achieved with the caveat of not being very tightly constrained. The role of the resonances is found to be crucial. Consequences for further investigations and open questions are addressed.

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Phys. Rev. D 114, 054051– Published 28 September, 2026
  • Received 16 April 2026
  • Accepted 8 September 2026
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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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