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A First Glimpse of Strange Matter?

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Science  10 May 1996:
Vol. 272, Issue 5263, pp. 815
DOI: 10.1126/science.272.5263.815


Two particles of strange matter may have made a fleeting appearance in a detector at Brookhaven National Laboratory. All matter in the universe seems to be composed of just two of the six available kinds of quarks, the up and the down, but theoretical calculations suggest that mixing in a fair share of strange quarks, the next heaviest type, should yield another family of stable particles—strange matter. The Brookhaven result might be the first detection of the lightest form of strange matter, a six-quark particle called the H. But with just two events, the physicists aren't ready to claim a discovery.