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異種中間子
Wikipedia definition
1. Exotic mesonNon-quark model mesons include exotic mesons, which have quantum numbers not possible for mesons in the quark model; glueballs or gluonium, which have no valence quarks at all; tetraquarks, which have two valence quark-antiquark pairs; and hybrid mesons, which contain a valence quark-antiquark pair and one or more gluons. All of these can be classed as mesons, because they are hadrons and carry zero baryon number.
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