Scales tilt against five-quark particles

By Peter Weiss, 15:52 PM April 15, 2008

From Tampa, at a meeting of the American Physical Society

May the best data win. In the past 2 years, evidence has quickly mounted for the existence of pentaquarks, never-before-seen subatomic particles theoretically composed of five quarks or antiquarks, which are fundamental constituents of matter. Lately, however, evidence against pentaquarks has been mounting even faster, reports Curtis A. Meyer of Carnegie Mellon University in Pittsburgh.

Physicists have long known that types of quarks an...

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