LHCb has discovered a couple of tetraquarks and pentaquarks in the last years. Recently they added one more, but this one is different from the previous discoveries. Tetraquarks have two quarks and two antiquarks. If all of them are light (up/down/strange) it's basically impossible to measure them and experimentally confirm that they actually have four quarks, so people mainly focus on tetraquarks with at least one heavy quark...
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