strange-particle

strange particle

noun Physics.
any elementary particle with a strangeness quantum number other than zero.

Origin:
1955–60; originally so called because of the anomalously long decay time of such particles

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American Heritage
Science Dictionary
strange particle  
Any of various unstable elementary particles, having a short half-life and a nonzero strangeness quantum number. Sigma and xi baryons, for example, are strange particles.
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