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

Lunghi, Enrico; Soni, Amarjit

doi:10.1007/jhep12(2024)097

Title: Light quark loops in $${K}^{\pm}\to {\pi}^{\pm}\nu \overline{\nu}$$ from vector meson dominance and update on the Kaon Unitarity Triangle

Journal Article · 11 December 2024 · Journal of High Energy Physics (Online)

DOI: https://doi.org/10.1007/jhep12(2024)097 · OSTI ID:2484016

^[1];

^[2]

Indiana Univ., Bloomington, IN (United States); European Organization for Nuclear Research (CERN), Geneva (Switzerland)
Brookhaven National Laboratory (BNL), Upton, NY (United States)

We use vector meson dominance to calculate non-perturbative contributions to the branching ratio of the rare decay $$K$$^± → π^±$$v\overline{v}$$ stemming from matrix elements involving up-quark loops. The importance of this observable as well as of K⁰ → π⁰l⁺l^- and of the direct CP violation parameter ϵ'_K is then discussed in the context of a Unitarity Triangle sqtudy based on Kaon sector observables only.

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Research Organization:: Brookhaven National Laboratory (BNL), Upton, NY (United States)

Sponsoring Organization:: USDOE Office of Science (SC), High Energy Physics (HEP)

Grant/Contract Number:: SC0012704

OSTI ID:: 2484016

Report Number(s):: BNL--226452-2024-JAAM

Journal Information:: Journal of High Energy Physics (Online), Journal Name: Journal of High Energy Physics (Online) Journal Issue: 12 Vol. 2024; ISSN 1029-8479

Publisher:: Springer NatureCopyright Statement

Country of Publication:: United States

Language:: English

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