Description of Doubly Heavy Tetraquarks Within the Relativistic Quark Model

Abstract

Within the relativistic quark model based on the quasipotential approach and QCD, tetraquarks containing two heavy flavors (charm c, bottom b) are studied. The tetraquark is considered as a bound state of a diquark and an antidiquark. The interaction potential in the relativistic quasipotential equation includes all spin-dependent and spin-independent relativistic contributions. The finite size of the diquark is taken into account. The calculated tetraquark masses are compared with the strong fall-apart decay thresholds into a pair of mesons and with experimental data. The states that could be observed as narrow resonances in other decay modes are identified.