Journal of High Energy Physics

, 2016:52 | Cite as

Global effective-field-theory analysis of new-physics effects in (semi)leptonic kaon decays

  • Martín González-Alonso
  • Jorge Martin CamalichEmail author
Open Access
Regular Article - Theoretical Physics


We analyze the decays Kπℓν and Pℓν (P = K, π, = e, μ) using a low-energy Effective-Field-Theory approach to parametrize New Physics and study the complementarity with baryon β decays. We then provide a road map for a global analysis of the experimental data, with all the Wilson coefficients simultaneously, and perform a fit leading to numerical bounds for them and for V us . A prominent result of our analysis is a reinterpretation of the well-known V ud V us diagram as a strong constraint on new physics. Finally, we reinterpret our bounds in terms of the SU(2) L × U(1) Y -invariant operators, provide bounds to the corresponding Wilson coefficients at the TeV scale and compare our results with collider searches at the LHC.


Beyond Standard Model Effective field theories Kaon Physics 


Open Access

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© The Author(s) 2016

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (, which permits use, duplication, adaptation, distribution, and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.

Authors and Affiliations

  • Martín González-Alonso
    • 1
  • Jorge Martin Camalich
    • 2
    Email author
  1. 1.IPN de Lyon/CNRS, Universite Lyon 1VilleurbanneFrance
  2. 2.CERN, Theoretical Physics DepartmentGenevaSwitzerland

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