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In particle physics, a pion (/ ˈpaɪ.ɒn /, PIE-on) or pi meson, denoted with the Greek letter pi (π), 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 ...
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Pion, Online Physics, Physics Encyclopedia, Science In particle physics, pion (short for pi meson) is the collective name for three subatomic particles: π 0, π + and π −. Pions are the lightest mesons (excluding the misnamed "Mu Meson" or muon) and play an important role in explaining low-energy properties of the strong nuclear force. Basic properties Pions have zero spin and are composed ...