Question: The pi mesons + and - are each composed of two quarks. The quark composition of the + is ud, while the

The pi mesons π+ and π- are each composed of two quarks. The quark composition of the π+ is ud̅, while the composition of the π- is u̅d. (a) What is the antiparticle of the π+? (b) The π- can decay into a muon and an antimuon neutrino according to

 π- → μ- + v̅μ


 What are the final quarks involved in this decay? (c) Does this decay conserve lepton number? If so, what is the final lepton number?

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