Isospin-violating contributions to ∈/∈

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title = "Isospin-violating contributions to ∈′/∈",
abstract = "The known isospin-breaking contributions to the K → ππ amplitudes are reanalyzed, taking into account our current understanding of the quark masses and the relevant non-perturbative inputs. We present a complete numerical reappraisal of the direct CP-violating ratio ∈′/∈, where these corrections play a quite significant role. We obtain the Standard Model prediction Re (∈′/∈) = (14 ± 5) · 10−4, which is in very good agreement with the measured ratio. The uncertainty, which has been estimated conservatively, is dominated by our current ignorance about 1/NC-suppressed contributions to some relevant chiral-perturbation-theory low-energy constants.",
keywords = "Chiral Lagrangians, CP violation, Effective Field Theories, Kaon Physics",
author = "V. Cirigliano and H. Gisbert and A. Pich and A. Rodr{\'i}guez-S{\'a}nchez",
year = "2020",
month = feb,
day = "1",
doi = "10.1007/JHEP02(2020)032",
language = "English",
volume = "2020",
journal = "Journal of High Energy Physics",
issn = "1029-8479",
publisher = "Springer",
number = "2",