Particle Zoo

The Standard Model

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The Pion

Symbol: π
Group: boson, hadron, meson
Rest mass: 0.150 u
Diameter: 1.3 x 10-15 m
Charge: -1, 0, +1
Mean lifetime: 2.6 x 10-8 sec
Spin: 0
Pions are particles made of one up and one anti- down+) or one antiup and one down quark (π-) or a quantum-mechanical state of superposition between these two (π0). The values to the left only apply to the first two, the π0 is slightly lighter and with 8.4 x 10-17 seconds much shorter lived.
Pions occur frequently at interactions in the atomic nucleus between protons and neutrons and so keep this together. This makes them fundamental parts of our matter, despite their short life.



Atom Dark Energy Baryons Mesons Proton Neutron Other Baryons Pion Kaon D-Meson Other Mesons Hadrons Up-Quark Down-Quark Strange-Quark Charm-Quark Bottom-Quark Top-Quark Quarks Leptons Electron Muon Tauon Fermions Neutrinos Electron-Neutrino Muon-Neutrino Tauon-Neutrino Antimatter Dark Matter Gauge Bosons Photon Gluon W-Boson Z-Boson Graviton Higgs-Boson Bosons