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Homework Help: Feymann diagram help

  1. Dec 10, 2009 #1
    1. The problem statement, all variables and given/known data
    B+ --> Do + u+ + Vu

    B and D are mesons and u is a muon and Vu its corrosponding neutrino.
    B composition u b*
    Do composition c u*

    Where * denotes the antiquark....

    3. The attempt at a solution

    I can do most diagrams, but this one is killing me!! I have looked up the Cern branching ratios and have seen that this is possible but can anyone point me in the right direction for drawing it?

    I have the D+ going to a W+ and Z boson, the W+ gives the Muon and neutrino and the Z the Do, but the Z cant couple to anti-u and c quarks....therefore my problem!

    Cheers
     
  2. jcsd
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