In particle physics, exotic mesons are mesons that have quantum numbers not possible in the quark model; some proposals for non-standard quark model mesons could be: glueballs or gluonium Glueballs have no valence quarks at all. tetraquarks Tetraquarks have two valence quark–antiquark pairs.
In particle physics, exotic mesons are mesons that have quantum numbers not possible in the quark model; some proposals for non-standard quark model mesons could be: glueballs or gluonium Glueballs have no valence quarks at all. tetraquarks Tetraquarks have two valence quark–antiquark pairs.
Source: Wikipedia "Exotic meson" · CC BY-SA 4.0
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