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Science Past from the issue of March 24, 1962

ANTI-PARTICLE DISCOVERED — Three international teams of scientists, working in the United States, Switzerland and France, have discovered and identified one of the last predicted anti-particles of matter, the anti-Xi-minus. Also known as the anti-cascade-hyperon, the tiny particle of anti-matter exists only for one ten-billionth of a second. Nevertheless, it has been observed, measured and photographed, the scientists report in Physical Review Letters, March 15, 1962. The discovery confirms the theory that there is an anti-particle for every known elementary particle.... The anti-Xi-minus is the heaviest of the predicted elementary particles to be observed. It has a positive charge.

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