Which of the following reactions are allowed, and which are forbidden, by the conservation laws appropriate to
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Which of the following reactions are allowed, and which are forbidden, by the conservation laws appropriate to weak interactions?
(a) νμ + p → μ+ + n,
(b) νe + p → e− + π + + p,
(c) ντ + e− → τ− + νe,
(d) τ+ → μ+ + v̅μ + ντ.
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