strange quark
The strange quark is a second-generation quark with a charge of −(1/3)e and a strangeness of −1. It is the third lightest quark after 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.
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 and flavorless mesons are linear combinations of several quark-antiquark pairs, including the strange-antistrange.
The flavorless meson is pure strange-antistrange.
Strange baryons are known as hyperons: the s and s have one strange quark, the s two, and the s three.
See also
Strange matter
Strange star
Strangelet
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