Abstract
The light neutral colour-singlet spin-zero bosons P 0 and P 3 expected in contemporary extended technicolour theories have some small induced flavour-changing couplings, even in monophagic theories where their couplings are mainly flavour-diagonal. Their non-observation in K + decay means that m P 0,3 ⪆ 350 MeV , leading one to expect direct quark-lepton transitions mediating K L 0 → μe decay close to the present experimental upper limit. In the absence of some as yet unknown suppression mechanisms, eitherP 0 and P 3 should be observed in bottom decays with a branching ratio approaching 100% (which may already be experimentally excluded) and/or they should be observed in charm decays with branching ratios ⪆ 1% and/or the decay K 0 L → μe should be detected within an order of magnitude of the present upper limit.
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