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The X(3872) is an anomalous particle which does not fit into the quark model because of its quantum numbers. It was discovered by the Belle experiment in Japan and later confirmed by several other experimental collaborations. Several theories have been proposed for its nature, such as a mesonic molecule or a diquark-antidiquark pair.

See also

This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "X(3872)". A list of authors is available in Wikipedia.
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