Dispersive treatment of Ks→γγ and Ks→γℓ+ℓ−

Colangelo, Gilberto; Stucki, Ramon; Tunstall, Lewis (2016). Dispersive treatment of Ks→γγ and Ks→γℓ+ℓ−. European physical journal. C - particles and fields, 76(11) EDP Sciences 10.1140/epjc/s10052-016-4449-2

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We analyse the rare kaon decays K S → γ γ and KS → γl+l− (l = e or μ) in a dispersive framework in which the weak Hamiltonian carries momentum. Our analy- sis extends predictions from lowest order SU (3)L × SU (3)R chiral perturbation theory (χ PT3 ) to fully account for effects from final-state interactions, and is free from ambiguities associated with extrapolating the kaon off-shell. Given input from KS → ππ and γγ(∗) → ππ, we solve the once- subtracted dispersion relations numerically to predict the rates for KS → γγ and KS → γl+l−. In the leptonic modes, we find sizeable corrections to the χ PT3 predictions for the integrated rates.

Item Type:

Journal Article (Original Article)

Division/Institute:

10 Strategic Research Centers > Albert Einstein Center for Fundamental Physics (AEC)
08 Faculty of Science > Institute of Theoretical Physics

UniBE Contributor:

Colangelo, Gilberto; Stucki, Ramon and Tunstall, Lewis

Subjects:

500 Science > 530 Physics

ISSN:

1434-6044

Publisher:

EDP Sciences

Language:

English

Submitter:

Esther Fiechter

Date Deposited:

14 Dec 2016 16:13

Last Modified:

12 Feb 2017 02:11

Publisher DOI:

10.1140/epjc/s10052-016-4449-2

ArXiv ID:

1609.03574

BORIS DOI:

10.7892/boris.91501

URI:

https://boris.unibe.ch/id/eprint/91501

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