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 P: 11 Thanks Diazona. I just wanted to double check that, as I have never seen an example of that occurring! Also, since I have a c $$\rightarrow$$ u and W+ $$\rightarrow$$ u + anti-s I have two vertices for the decay D0 $$\rightarrow$$ K+ + $$\pi$$-. This means the total decay rate will depend on the square of the coupling constants gcu and guanti-s multiplied togther. But because of the CKM matrix gcu = gwsin$$\vartheta$$c and guanti-s = gwsin$$\vartheta$$c. Where gw is given to be 10^-5 So the total decay rate for D0 $$\rightarrow$$ K+ + $$\pi$$- ~ g2cug2uanti-s = (gwsin$$\vartheta$$c)2 Is this right? Thanks