MCQ
$\pi $ mesons can be
  • A
    ${\pi ^ + }$ or ${\pi ^ - }$
  • B
    ${\pi ^ + }$ or ${\pi ^0}$
  • C
    ${\pi ^ - }$ or ${\pi ^0}$
  • ${\pi ^ + },\;{\pi ^ - }$ or ${\pi ^0}$

Answer

Correct option: D.
${\pi ^ + },\;{\pi ^ - }$ or ${\pi ^0}$
d
(d) $p \to {\pi ^ + } + n,$ $n \to p + {\pi ^ - }$ and $n \to n' + {\pi ^0}$

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