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  • Open Access

Natural complex plane for kaon CKM data: Framework, status, and future prospects

Avital Dery*

  • CERN, Theoretical Physics Department, Geneva, Switzerland

  • *Contact author: avital.dery@cern.ch
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Phys. Rev. D 112, 053005 – Published 19 September, 2025

DOI: https://doi.org/10.1103/dz6j-q85l

Abstract

Kaon physics can be used to independently determine three out of the four parameters of the CKM matrix, without any B physics input. Treating one parameter, |Vus|, or alternatively Wolfenstein λ, as well known, we show that the natural plane for the presentation of kaon CKM information is spanned by the combinations [A2(1−ρ^),A2η^]. In this way, the use of B physics inputs is avoided, as well as the artificial inflation of errors due to parametric uncertainties, mainly due to |Vcb|. We show that the current status of kaon CKM constraints, impacted by recent advances in measurement and theory, is characterized by four allowed regions, and find that incoming data will inevitably disfavor a number of them, either confirming the CKM paradigm as dominant, or discovering a departure from the Standard Model.

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Phys. Rev. D 112, 053005– Published 19 September, 2025
  • Received 2 May 2025
  • Accepted 2 September 2025
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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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