Sigma (particle)

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The sigma is a baryon.

The sigma particles Σ+, Σ0, and Σ− are composed of one strange quark and a combination of up and down quarks, arranged in an isospin 1 state. These are hyperons.

The term sigma also can be used for Bottom baryons. They are not hyperons.

See List of baryons for details on each particle.

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