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Strange Quark <tr> <th>Composition:</th> <td>Elementary particle</td> </tr><tr> <th>Family:</th> <td>Fermion</td> </tr><tr> <th>Group:</th> <td>Quark</td> </tr><tr> <th>Generation:</th> <td>Second</td> </tr><tr> <th>Mass:</th> <td>80 - 130 MeV/c2</td> </tr><tr> <th>Electric charge:</th> <td>-1/3 e</td> </tr><tr> <th>Spin:</th> <td>½</td> </tr>

The strange quark is a second-generation quark with a charge of -(1/3)e and a strangeness of −1. It is the lightest of the quarks except for the up and down quarks, with a mass of somewhere between 80 and 130 MeV. The first strange particle (particle containing a strange valence quark) was discovered in 1947, with the identification of the kaon, but the strange quark itself was not identified until Gell-Mann and Zweig developed the quark model in 1964.

[edit] Hadrons containing strange valence quarks

Hadrons containing strange valence quarks include the following:

• Kaons are mesons containing a strange quark (or its antiparticle) and an up or down quark.
• The η and η' flavorless mesons are linear combinations of several quark-antiquark pairs, including the strange-antistrange.
• The φ flavorless meson is pure strange-antistrange.
• Strange baryons are known as hyperons: the Σ and Λ have one strange quark, the Ξ two, and the Ω three.

[edit] See also

• Strange matter
• Strange star
• Strangelet

v • d • e</span>  Particles in physics - elementary particles

Fermions: Quarks: (Up · Down · Strange · Charm · Bottom · Top) | Leptons: (Electron · Muon · Tau · Neutrinos)

Gauge bosons: Photon | W and Z bosons | Gluons

Not yet observed: Higgs boson | Graviton | Other hypothetical particles

es:Quark extraño

fr:Quark strange ja:ストレンジクォーク ko:야릇한 쿼크 it:Quark strange pl:Kwark dziwny ur:عجیب کوارک