A pentaquark is a hypothetical subatomic particle consisting of four quarks and one antiquark bound together (compared to three quarks in normal baryons). As quarks have a baryon number of +{frac|1|3}, and antiquarks of −{frac|1|3}, it would have a total baryon number of 1, thus being classified as an exotic baryon. The existence of pentaquarks ...
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http://en.wikipedia.org/wiki/Pentaquark
(from the article `Physical Sciences`) The existence of pentaquarks (particles made up of five quarks bound together), which a number of laboratories reported to have found in 2003, came ...
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http://www.britannica.com/eb/a-z/p/40
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