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Standard XII
Physics
Nuclear Structure
Question

What processes are described by the Feynman diagrams in Figure? (b) What is the exchanged
particle in each process?

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Solution
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(a) This diagram represents the electron-positron annihilation. From
charge and lepton-number conservation at either vertex, the exchanged particle must be an electron,$$e^−$$.

(b) A neutrino collides with a neutron, producing a proton and a
muon. This is a weak interaction. The exchanged particle has
charged $$+e$$ and is a $$W^+$$.

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