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The renormalization of theories with flavor mixing is discussed, and it isshown that the physical unstable particles should be interpreted asquasiparticles which cannot be regarded as external states. Several popularbeliefs on renormalization are disproved accordingly, and the limitations ofphysical renormalization schemes are discussed. In addition, the properties ofunstable particles with flavor mixing such as decay widths are studied fromscattering mediated by them.

Flavor mixing and renormalization in a perturbation theory