Light quark loops in K ± → π ± ν ν ¯ $$ {K}^{\pm}\to {\pi}^{\pm}\nu \overline{\nu} $$ from vector meson dominance and update on the Kaon Unitarity Triangle

Light quark loops in K ± → π ± ν ν ¯ $$ {K}^{\pm}\to {\pi}^{\pm}\nu \overline{\nu} $$ from vector meson dominance and update on the Kaon Unitarity Triangle

Abstract We use vector meson dominance to calculate non-perturbative contributions to the branching ratio of the rare decay K ± → π ± ν ν ¯ $$ {K}^{\pm}\to {\pi}^{\pm}\nu \overline{\nu} $$ stemming from matrix elements involving up-quark loops. The importance of this observable as well as of K 0 → π...

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Bibliographic Details
Main Authors: Enrico Lunghi, Amarjit Soni
Format: Article
Language:English
Published: SpringerOpen 2024-12-01
Series:Journal of High Energy Physics
Subjects:
Chiral Lagrangian
Kaons
Rare Decays
CKM Parameters
Online Access:https://doi.org/10.1007/JHEP12(2024)097
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Summary:Abstract We use vector meson dominance to calculate non-perturbative contributions to the branching ratio of the rare decay K ± → π ± ν ν ¯ $$ {K}^{\pm}\to {\pi}^{\pm}\nu \overline{\nu} $$ stemming from matrix elements involving up-quark loops. The importance of this observable as well as of K 0 → π 0 l + l − and of the direct CP violation parameter ϵ K ′ $$ {\epsilon}_K^{\prime } $$ is then discussed in the context of a Unitarity Triangle sqtudy based on Kaon sector observables only.
ISSN:1029-8479

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