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Collisions Hint That Quarks Might Not Be Indivisible

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Science  09 Feb 1996:
Vol. 271, Issue 5250, pp. 758
DOI: 10.1126/science.271.5250.758

Summary

Batavia, Illinois—In a year's harvest of data from the Tevatron particle accelerator at the Fermi National Accelerator Laboratory, a large collaboration of physicists has found hints that quarks may have internal structure. Because quarks are now thought to be fundamental particles, the evidence—a slight excess in the number of sideways jets of debris spurting from proton-antiproton collisions—could challenge the reigning theory of matter. But the Fermilab physicists caution that there are other, less revolutionary, ways to explain the data.