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This topic has appeared in the English Wikipedia rankings 1 time. It first appeared on 2026-05-12 and was most recently seen on 2026-05-12.
In particle physics, a pion or pi meson, denoted with the Greek letter pi, is any of three subatomic particles: π0, π+, and π−. Each pion consists of a quark and an antiquark and is therefore a meson. Pions are the lightest mesons and, more generally, the lightest hadrons. They are unstable, with the charged pions π+ and π− decaying after a mean lifetime of 26.033 nanoseconds, and the neutral pion π0 decaying after a much shorter lifetime of 85 attoseconds. Charged pions most often decay into muons and muon neutrinos, while neutral pions generally decay into gamma rays.
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