Strange quark
From Free net encyclopedia
The strange quark is a second-generation quark with a charge of -(1/3)e and a strangeness of −1. It is the lightest quark except for the up and down, with a mass of somewhere between 80 and 130 MeV. The first strange particle (particle containing a strange 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.
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Hadrons containing strange quarks
Some of the hadrons containing strange quarks include:
- 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.
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| Fermions: Quarks | Leptons | |
| 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 | |
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