Physics 357 : 1998 Lecture 20 supplement
Quarks do not exist in isolation. When they weakly decay they are part of a hadron (except for top quarks). This leads to two effects:
(1) Strong interactions affect the decay rates. These affects are similar to the Coulomb corrections and nuclear wavefunction corrections for beta decays (see F&H Sections 11.1 & 11.2).
(2) Annihilation and exchange decays are possible:
Ds+->m+nm annihilation decay
D0->K-p+ exchange decay
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