“sigma hyperon”的概念、定义、翻译、参考文献-科学参考

单词	sigma hyperon
释义	sigma hyperon [`sig·mǝ `hī·pǝ´rän] ^{PARTICLE PHYSICS} 1. The collective name for three semistable baryons with charges of +1, 0, and -1 times the proton charge, designated Σ⁺, Σ⁰, and Σ^-, all having masses of approximately 1193 megaelectronvolts, spin of ¹/₂, and positive parity; they form an isotopic spin multiplet with a total isotopic spin of 1 and a hypercharge of 0. 2. Any baryon belonging to an isotopic spin multiplet having a total isotopic spin of 1 and a hypercharge of 0; designated Σ_J^P(m ), where m is the mass of the baryon in megaelectronvolts, and J and P are its spin and parity; the Σ_3/2+(1385) is sometimes designated Σ*.
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