Sigma-baryon meaning

Any of a group of three unstable baryons containing a strange quark and having a positive, neutral, or negative electric charge and a mass from 2,328 to 2,343 times that of an electron.
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Any of three unstable subatomic particles in the baryon family, having a mass 2,328 to 2,343 times that of the electron and a positive, neutral, or negative electron charge.
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