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出典:『Wikipedia』 (2011/06/27 17:52 UTC 版)

英語による解説

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In particle physics, lambda (Λ) baryons are baryons containing an up quark, a down quark, and a third quark, either a strange quark (Λ0
), a charm quark (Λ+
c) or a bottom quark (Λ0
b). The first Lambda particle discovered (Λ0
) was discovered in 1947 during a study of cosmic ray interactions. Though the particle was expected to live for ~10⁻²³ seconds, it actually survived for ~10⁻¹⁰ seconds. The property which caused it to live so long was dubbed strangeness, and led to the discovery of the strange quark. Furthermore, these discoveries led to a principle known as the conservation of strangeness, wherein lightweight particles do not decay as quickly if they exhibit strangeness (because non-weak methods of particle decay must preserve the strangeness of the decaying baryon).