Abstract: Heavy-quark predictions for hadronic weak-decay transition amplitudes have O(1m) corrections, but we show these always vanish at threshold. This follows from the nonrenormalization of the threshold effective currents at O(1m), and an application of the Ademollo-Gatto theorem. The result, which we call Luke's theorem, holds for initial and final particles consisting of a heavy quark or scalar and light degrees of freedom in an arbitrary spin state.
Publication Year: 1991
Publication Date: 1991-03-01
Language: en
Type: article
Indexed In: ['crossref']
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Cited By Count: 36
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