%0 Journal Article
%T Isospin-violating contributions to epsilon '/epsilon
%A Cirigliano, V.
%A Gisbert, H.
%A Pich, A.
%A Rodriguez-Sanchez, A.
%J Journal of High Energy Physics
%D 2020
%V 02
%N 2
%I Springer
%@ 1029-8479
%G English
%F Cirigliano_etal2020
%O WOS:000515816800001
%O exported from refbase (https://references.ific.uv.es/refbase/show.php?record=4304), last updated on Wed, 11 Mar 2020 08:48:13 +0000
%X The known isospin-breaking contributions to the K -> pi pi 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 is an element of(')/is an element of, where these corrections play a quite significant role. We obtain the Standard Model prediction Re (is an element of(')/is an element of) = (14 +/- 5) <bold> </bold>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/N-C-suppressed contributions to some relevant chiral-perturbation-theory low-energy constants.
%K Chiral Lagrangians
%K CP violation
%K Effective Field Theories
%K Kaon Physics
%R 10.1007/JHEP02(2020)032
%U https://arxiv.org/abs/1911.01359
%U https://doi.org/10.1007/JHEP02(2020)032
%P 032-44pp