Dispersive analysis of K S → γγ and K S → γl + l −
Publisher DOI
Abstract
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.
Date Issued
2017-03-27
Publication Type
Conference Item
Subject(s)
Language(s)
en
Journal
Journal of Physics: Conference Series
Publisher
Institute of Physics Publishing IOP
ISSN
1742-6588
Title of Event
Access(Rights)
open.access