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The s-d transition element and the ΔI = 1/2 rule
journal contribution
posted on 2023-05-18, 04:57 authored by Robert DelbourgoRobert Delbourgo, Scadron, MDIt is confirmed that the sum of s-d self-energy graphs is gauge-parameter independent on the quark mass shells for finiteRξ gauges. It is argued that the result, of orderO(M w -2 ), has physical significance and, to avoid confusion, should not be rotated away by rediagonalization. In particular, the ensuing s π|H W,eff|K s transition becomes the origin of the ΔI = 1/2 rule for kaon decays, consistent with observation, both in magnitude and in sign.
History
Publication title
Lettere Al Nuovo CimentoVolume
44Issue
4Pagination
193-198ISSN
0375-930XDepartment/School
School of Natural SciencesPlace of publication
ItalyRepository Status
- Restricted