本题目来源于试卷: Elementary Particles，类别为 IB物理学
[问答题]
Which of the following reactions are pd vlxu54a0 z8pem*hl(ossible, and by what inthg7i(d uti1 xk i3*d2d59jslq eraction could they occur? For those forbiddxk iu*d9h 5dt23lji sgq1 di7(en, explain why.
(a) $p + \pi^- \to K^0 + p + \pi^0$
(b) $p + K^- \to \Lambda^0 + \pi^0$
(c) $n + K^+ \to \Sigma^+ + \pi^0 + \gamma$
(d) $K^- \to \pi^- + \pi^0 + \pi^+$
(e) $\pi^+ \to e^+ + \nu_e$
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