particle

symbol

antipart.

composition

mass (MeV/c²)

I^G

J^PC

S

C

B

lifetime(s)

main decay

ch-pion

${\pi }^{+}$

${\pi }^{-}$

$u\overline{d}$

139.57018 ± 0.00035

1⁻

0⁻

0

0

0

2.6033 ± 0.0005 × 10⁻⁸

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

n-pion

${\pi }^0$

$\left(u\overline{u}-d\overline{d}\right)/\sqrt{2}$

13.9766 ± 0.0006

1⁻

0^±

0

0

0

8.4 ± 0.6 × 10⁻¹⁷

$\gamma +\gamma$