TY  - JOUR
AU  - Cirigliano, V.
AU  - Gisbert, H.
AU  - Pich, A.
AU  - Rodriguez-Sanchez, A.
PY  - 2020
DA  - 2020//
TI  - Isospin-violating contributions to epsilon '/epsilon
T2  - J. High Energy Phys.
JO  - Journal of High Energy Physics
SP  - 032
EP  - 44pp
VL  - 02
IS  - 2
PB  - Springer
KW  - Chiral Lagrangians
KW  - CP violation
KW  - Effective Field Theories
KW  - Kaon Physics
AB  - 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.
SN  - 1029-8479
UR  - https://arxiv.org/abs/1911.01359
UR  - https://doi.org/10.1007/JHEP02(2020)032
DO  - 10.1007/JHEP02(2020)032
LA  - English
N1  - WOS:000515816800001
ID  - Cirigliano_etal2020
ER  -