QUARK OFF-SHELL EFFECTS IN FLAVOUR-CHANGING DECAYS

preprint1995arXivOpen access

Abstract

We discuss some flavour-changing effective Lagrangians, obtained from scales above 1 GeV, which vanish on the quark mass shell. Although the effects of such effective Lagrangians are zero in the limit of vanishing bound-state interactions, we have shown that they have a significant impact on the processes K→γγK\rightarrowγγ and Bs→γγB_s \rightarrowγγ.

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