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Isospin-violating contributions to ∈′/∈

Cirigliano, V. ; Gisbert, H. ; Pich, A. and Rodríguez-Sánchez, A. LU (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.

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author
; ; and
organization
publishing date
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}},
}