Isospin-violating contributions to ∈′/∈
(2020) In Journal of High Energy Physics 2020(2).- 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.
Please use this url to cite or link to this publication:
https://lup.lub.lu.se/record/22e5a23a-c862-440c-b3cc-d0c412f892be
- author
- Cirigliano, V. ; Gisbert, H. ; Pich, A. and Rodríguez-Sánchez, A. LU
- organization
- publishing date
- 2020-02-01
- type
- Contribution to journal
- publication status
- published
- subject
- keywords
- Chiral Lagrangians, CP violation, Effective Field Theories, Kaon Physics
- in
- Journal of High Energy Physics
- volume
- 2020
- issue
- 2
- article number
- 32
- publisher
- Springer
- external identifiers
-
- scopus:85079421177
- ISSN
- 1029-8479
- DOI
- 10.1007/JHEP02(2020)032
- language
- English
- LU publication?
- yes
- id
- 22e5a23a-c862-440c-b3cc-d0c412f892be
- date added to LUP
- 2020-02-28 09:48:09
- date last changed
- 2024-04-17 05:10:22
@article{22e5a23a-c862-440c-b3cc-d0c412f892be, abstract = {{<p>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 ∈<sup>′</sup>/∈, where these corrections play a quite significant role. We obtain the Standard Model prediction Re (∈<sup>′</sup>/∈) = (14 ± 5) · 10<sup>−4</sup>, 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<sub>C</sub>-suppressed contributions to some relevant chiral-perturbation-theory low-energy constants.</p>}}, author = {{Cirigliano, V. and Gisbert, H. and Pich, A. and Rodríguez-Sánchez, A.}}, issn = {{1029-8479}}, keywords = {{Chiral Lagrangians; CP violation; Effective Field Theories; Kaon Physics}}, language = {{eng}}, month = {{02}}, number = {{2}}, publisher = {{Springer}}, series = {{Journal of High Energy Physics}}, title = {{Isospin-violating contributions to ∈<sup>′</sup>/∈}}, url = {{http://dx.doi.org/10.1007/JHEP02(2020)032}}, doi = {{10.1007/JHEP02(2020)032}}, volume = {{2020}}, year = {{2020}}, }