Question: Establish which of the following processes, which might be virtual, are allowed and which are forbidden, and give the reasons: W - d L

Establish which of the following processes, which might be virtual, are allowed and which are forbidden, and give the reasons: W^- → d_L + u̅_L, W^- → u_L + u̅_R, Z → W^-+W⁺, W⁺ → e⁺_R+ ν̅_L.

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