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Isospin-violating contributions to ∈′/∈

AuthorsCirigliano, V.; Gisbert, H.; Pich, Antonio ; Rodríguez-Sánchez, Antonio
Issue DateFeb-2020
PublisherInstitute of Physics Publishing
CitationJournal of High Energy Physics, 2: 032 (2020)
AbstractThe 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, 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/N-suppressed contributions to some relevant chiral-perturbation-theory low-energy constants.
Publisher version (URL)http://dx.doi.org/10.1007/JHEP02(2020)032
Identifiersdoi: 10.1007/JHEP02(2020)032
issn: 1029-8479
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