KBriggs
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Can an up quark absorb a negative W particle and become a strange quark? I know s can turn into u via the opposite process (emission of positive W), but can the interaction go the other way?
This arises when trying to draw the Feynman diagram for the rather unlikely decay
B^+\to D_s^++\bar{K^0}
This arises when trying to draw the Feynman diagram for the rather unlikely decay
B^+\to D_s^++\bar{K^0}