Dispersive analysis of K S → γγ and K S → γl + l −

Tunstall, Lewis; Colangelo, Gilberto; Stucki, Ramon (27 March 2017). Dispersive analysis of K S → γγ and K S → γl + l −. Journal of Physics: Conference Series, 800(1), 012034. Institute of Physics Publishing IOP 10.1088/1742-6596/800/1/012034

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We calculate the decay rates for KS → γγ and KS → γl + l − (l = e or μ)within a dispersive framework in which the weak Hamiltonian carries momentum. Given input from KS → ππ and γγ (*)→ππ, we solve the once-subtracted dispersion relations numerically and find that final-state ππ interactions generate sizeable corrections to the predictions from 3-flavour chiral perturbation theory. Our analysis predicts BR(KS → γγ) = (2.34 ± 0.31) × 10−6, BR(KS → γe + e −) = (4.38 ± 0.57) × 10−8, and BR(KS → γμ + μ −) = (1.45 ± 0.27) × 10−9.

Item Type:

Conference or Workshop Item (Paper)

Division/Institute:

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

UniBE Contributor:

Tunstall, Lewis; Colangelo, Gilberto and Stucki, Ramon

Subjects:

500 Science > 530 Physics

ISSN:

1742-6588

Publisher:

Institute of Physics Publishing IOP

Language:

English

Submitter:

Esther Fiechter

Date Deposited:

03 Nov 2017 10:07

Last Modified:

03 Nov 2017 10:07

Publisher DOI:

10.1088/1742-6596/800/1/012034

BORIS DOI:

10.7892/boris.102043

URI:

https://boris.unibe.ch/id/eprint/102043

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