The double-charm tetraquark (T+cc, ccud) is a type of long-lived tetraquark that was discovered in 2021 in the LHCb experiment conducted at the Large Hadron Collider.[3][4][2][5] It contains four quarks: two charm quarks, an anti-up and an anti-down quark.[1]
It has a theoretical computed mass of 3868±124 MeV/c2.[1] The discovery showed an exceptionally strong peak, with 20-sigma significance.[6]
It is hypothesized that studying the behavior of the double-charm tetraquark may play a part in explaining the behavior of the strong force.[7] Following the discovery of the T+cc, researchers now plan experiments to find its double-beauty counterpart Tbb.[8] This tetraquark has been found to have a longer lifespan than most known exotic-matter particles.
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