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Homework Statement
Draw feynman diagrams for pi+ muon lepton decay and suggest which process is more likely.
Homework Equations
The Attempt at a Solution
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The feynman diagrams are:
The lepton decays proceed via the weak interaction W+ boson. This implies that e+ should be right-handed and neutrino is always left-handed. In the rest frame of W+, we get:
But this implies that total spin = 1, which is not true. Therefore, e+ must be left-handed?