Pion
Neutral pion decays
The π⁰ meson has a mass of 135.0 MeV/c² and a mean lifetime of 8.4×10−17 s. It decays via the electromagnetic force, which explains why its mean lifetime is much smaller than that of the charged pion (which can only decay via the weak force).

Pion

Section Title: Neutral pion decays
Table Section Text: The π⁰ meson has a mass of 135.0 MeV/c² and a mean lifetime of 8.4×10−17 s. It decays via the electromagnetic force, which explains why its mean lifetime is much smaller than that of the charged pion (which can only decay via the weak force).

Particle name	Particle symbol	Antiparticle symbol	Quark content	Rest mass (MeV/c2)	IG	JPC	S	C	B'	Mean lifetime (s)	Commonly decays to (>5% of decays)

Pion	π+	π−	u d	139.570 18 ± 0.000 35	1−	0−	0	0	0	2.6033 ± 0.0005 × 10−8	μ+ + ν μ

Pion	π0	Self	134.976 6 ± 0.000 6	1−	0−+	0	0	0	8.4 ± 0.6 × 10−17	γ + γ

Sentence(s)

The π± mesons have a mean lifetime of 2.6033×10−8 s.

final_sentence: The π± mesons have a mean lifetime of 2.6033×10−8 s.