Σ粒子

在粒子物理中，Σ粒子一类由三个夸克组成的重子。两个上夸克（或两个下夸克）和一个奇夸克组成Σ；两个上夸克（或两个下夸克）和一个粲夸克组成Σ
c；两个上夸克（或两个下夸克）和一个底夸克组成Σ
b。

单词	Sigma baryon
释义	Sigma baryon 中文百科 Σ粒子在粒子物理中，Σ粒子一类由三个夸克组成的重子。两个上夸克（或两个下夸克）和一个奇夸克组成Σ；两个上夸克（或两个下夸克）和一个粲夸克组成Σ c；两个上夸克（或两个下夸克）和一个底夸克组成Σ b。英语百科 Sigma baryon Σ粒子 The Sigma baryons are a family of subatomic hadron particles which have a +2, +1 or −1 elementary charge or are neutral. They are baryons containing three quarks: two up and/or down quarks, and one third quark, which can be either a strange (symbols Σ+, Σ0, Σ−), a charm (symbols Σ++ c, Σ+ c, Σ0 c), a bottom (symbols Σ+ b, Σ0 b, Σ− b) or a top (symbols Σ++ t, Σ+ t, Σ0 t) quark. However, the top Sigmas are not expected to be observed as the Standard Model predicts the mean lifetime of top quarks to be roughly 6975500000000000000♠5×10 s. This is about 20 times shorter than the timescale for strong interactions, and therefore it does not form hadrons.
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Sigma baryon

Σ粒子

Sigma baryon Σ粒子