We revisit the calculation of the long distance contribution to KL → μ+μ-. We discuss this process within the framework of chiral perturbation theory, and also using simple models for the KLγ*γ* vertex. We argue that it is unlikely that this mode can be used to extract information on short distance parameters. The process KL → e+e- is also long-distance dominated and we find that B(KL → e+e-) ≈ 9 × 10-12.
|Number of pages||14|
|Journal||Nuclear Physics B|
|Publication status||Published - 27 Apr 1998|
- Chiral perturbation theory
- Rare kaon decays electromagnetic contributions to kaon decays long distance contributions