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 and decays aref/ot.uu vw+.j , li+lm posss0nlx zsqmvv3 66n5okzvbuw :m b b,*z g-/g*7ible? For those forbidden, explain what laws are vimq- *7,kl suvgvw z xm*zbng:5n o3bsz/v b606olated.
(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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