sigma hyperon

[′sig·mə ′hī·pə‚rän] (particle physics) 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 ½, and positive parity; they form an isotopic spin multiplet with a total isotopic spin of 1 and a hypercharge of 0. 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*.

单词	sigma hyperon
释义	sigma hyperon sigma hyperon [′sig·mə ′hī·pə‚rän] (particle physics) 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 ½, and positive parity; they form an isotopic spin multiplet with a total isotopic spin of 1 and a hypercharge of 0. 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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