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) Λ → π+ + e− + ν̅e;
(b) K+ → π+ + e− + ¯ ν̅e ;
(c) K+ → π0 + μ+ + ν̅μ;
(d) K− → π− + e+ + e−.
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