Masses of tetraquarks with two heavy quarks ( QQ 1pt 'q̄q̄ 1pt ' ) are calculated within the relativistic quark model, based on the quasipotential approach in QCD and diquark–antidiquark picture of tetraquarks. The relativistic quasipotential equation takes into account all spin–dependent and spin–independent relativistic corrections and the internal structure of the diquarks. The calculated masses of such tetraquarks are compared with the strong fall–apart decay thresholds into a pair of mesons. The states that could be observed as narrow resonances in other decay modes are determined.
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Galkin et al. (2026) studied this question.
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