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Science 8 March 1996:
Vol. 271. no. 5254, pp. 1361 - 1362
DOI: 10.1126/science.271.5254.1361
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Research News

Steve Nadis

A group of physicists led by Nobelist Martin Perl is searching for a particle that theory rules out: a free quark. Quarks, the elementary particles that make up protons and neutrons, should exist only in groups, says a theory known as QCD. But on the off chance that QCD isn't watertight, Perl and his colleagues are staging a high-tech version of Robert Millikan's famous oil-drop experiment, in which he measured the charge of the electron. By watching oil droplets fall through a changing electric field, Perl hopes to detect an even smaller morsel of charge, evidence of a lone quark.


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