Pion

An animation of the nuclear force (or residual strong force) interaction. The small colored double disks are gluons. Anticolors are shown as per this diagram (larger version).

The same process as in the animation with the individual quark constituents shown, to illustrate how the fundamental strong interaction gives rise to the nuclear force. Straight lines are quarks, while multi-colored loops are gluons (the carriers of the fundamental force). Other gluons, which bind together the proton, neutron, and pion

Feynman diagram of the dominating leptonic pion decay.

In particle physics, a pion (or a 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), because they are composed of the lightest quarks (the u and d quarks). They are unstable, with the charged pions π+ and π− decaying with a mean lifetime of 26 nanoseconds (6992260000000000000♠2.6×10 seconds), and the neutral pion π0 decaying with a much shorter lifetime of 6983840000000000000♠8.4×10 seconds. Charged pions most often decay into muons and muon neutrinos, while neutral pions generally decay into gamma rays.

单词	Pi Mesons
释义	Pi Mesons 英语百科 Pion In particle physics, a pion (or a 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), because they are composed of the lightest quarks (the u and d quarks). They are unstable, with the charged pions π+ and π− decaying with a mean lifetime of 26 nanoseconds (6992260000000000000♠2.6×10 seconds), and the neutral pion π0 decaying with a much shorter lifetime of 6983840000000000000♠8.4×10 seconds. Charged pions most often decay into muons and muon neutrinos, while neutral pions generally decay into gamma rays.
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Pi Mesons

Pion