QUARK OFF-SHELL EFFECTS IN FLAVOUR-CHANGING DECAYS

Physics – High Energy Physics – High Energy Physics - Phenomenology

Scientific paper

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10 pages (latex), uses (appended) macros required by the World Scientific publisher, 3 figures not included, talk given by J.O

Scientific paper

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 $K\rightarrow\gamma\gamma$ and $B_s \rightarrow\gamma\gamma$.

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