Isospin-violating contributions to ∈/∈

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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.

Detaljer

Författare
Enheter & grupper
Externa organisationer
  • Technical University of Dortmund
  • University of Valencia
  • Los Alamos National Laboratory
Forskningsområden

Ämnesklassifikation (UKÄ) – OBLIGATORISK

  • Subatomär fysik

Nyckelord

Originalspråkengelska
Artikelnummer32
TidskriftJournal of High Energy Physics
Volym2020
Utgåva nummer2
StatusPublished - 2020 feb 1
PublikationskategoriForskning
Peer review utfördJa