Reaction

Mode

Branching ratio

${\mu }^{+}+{\nu }_{\mu }$

leptonic

63.55% ± 0.11%

${\pi }^{+}+{\pi }^0$

hadronic

20.66% ± 0.08%

${\pi }^{+}+{\pi }^{+}+{\pi }^{-}$

hadronic

5.59% ± 0.04%

${\pi }^{+}+{\pi }^0+{\pi }^0$

hadronic

1.761% ± 0.022%

${\pi }^0+e^{+}+{\nu }_e$

semileptonic

5.07% ± 0.04%

${\pi }^0+{\mu }^{+}+{\nu }_{\mu }$

semileptonic

3.353% ± 0.034%