The CKM parameters in the SMEFT
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13130_2019_Article_10633.pdf
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Author(s)
Descotes-Genon, Sébastien
Falkowski, Adam
Fedele, Marco
González-Alonso, Martín
Virto, Javier
Date Issued
May 27, 2019
Publisher
Springer Berlin Heidelberg
Citation
Journal of High Energy Physics. 2019 May 27;2019(5):172
Version
Final published version
Abstract
Abstract
The extraction of the Cabibbo-Kobayashi-Maskawa (CKM) matrix from flavour observables can be affected by physics beyond the Standard Model (SM). We provide a general roadmap to take this into account, which we apply to the case of the Standard Model Effective Field Theory (SMEFT). We choose a set of four input observables that determine the four Wolfenstein parameters, and discuss how the effects of dimension-six operators can be included in their definition. We provide numerical values and confidence intervals for the CKM parameters, and compare them with the results of CKM fits obtained in the SM context. Our approach allows one to perform general SMEFT analyses in a consistent fashion, independently of any assumptions about the way new physics affects flavour observables. We discuss a few examples illustrating how our approach can be implemented in practice.
MIT Department
Massachusetts Institute of Technology. Center for Theoretical Physics
Terms of Use
Creative Commons Attribution
Persistent DSpace Link
DOI of Published Version
https://doi.org/10.1007/JHEP05(2019)172
