Summary
It 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 -2w ), 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.
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Delbourgo, E., Scadron, M.D. The s-d transition element and the ΔI = 1/2 rule. Lett. Nuovo Cimento 44, 193–198 (1985). https://doi.org/10.1007/BF02746805
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DOI: https://doi.org/10.1007/BF02746805