Abstract
We study a class of diagrams, that has previously been overlooked, contributing to the (dispersive) electromagnetic part of the K L → μ + μ − amplitude. The strength of this extra contribution can be estimated in different models and could be measured in related processes. By combining these results with those coming from the K 0 K 0 transition (evaluated in the Kobayashi-Maskawa scheme) we obtain rather strong constraints on the t quark mass and the B meson lifetime. The recently measured value for the B meson lifetime is difficult to accommodate unless the t quark is very heavy; m t > 100 GeV could be natural values according to the analysis.
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