本题目来源于试卷: Elementary Particles，类别为 IB物理学
[问答题]
Which of the following reactio)xr ;vu(t6fe ons any3b(kfra- lw; (t,tjtd decays are possible? For those forbidden, explai-kt(rt jwy a (,bt;lf3n what laws are violated.
(a) $\pi^- + p \to n + \pi^0$
(b) $p \to e^+ + \nu_e$
(c) $p + p \to p + e^+ + \pi^+$
(d) $\pi^- \to e^- + \bar{\nu}_e$
(e) $\mu^+ \to e^+ + \nu_\mu$
(f) $p \to n + e^+ + \nu_e$
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