January, 2005 Kowalewski --- Perugia lectures 32 B decay basics B mesons are the lightest b-flavored particles; they must decay weakly (Δb=1) The 0 th order picture is of a free b quark weak decay Putting back the light quark we get the spectator (or external W emission) decays Other decay diagrams are suppressed either by color matching or some power of 1/m B.
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