Isospin-violating contributions to ∈′/∈

被引：0
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作者：
V. Cirigliano
H. Gisbert
A. Pich
A. Rodríguez-Sánchez
机构：
[1] Los Alamos National Laboratory,Theoretical Division
[2] Fakultät Physik,Departament de Física Teòrica, IFIC
[3] TU Dortmund,Department of Astronomy and Theoretical Physics
[4] CSIC — Universitat de València,undefined
[5] Edifici d’Instituts de Paterna,undefined
[6] Lund University,undefined
来源：
Journal of High Energy Physics | / 2020卷
关键词：
Chiral Lagrangians; CP violation; Effective Field Theories; Kaon Physics;
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摘要：
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.
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