arXiv:2208.02730·v2·High Energy Physics — Phenomenology
Doubly Heavy Tetraquarks in the Born-Oppenheimer approximation
Luciano Maiani🇮🇹 · Alessandro Pilloni🇮🇹 · Antonio D. Polosa🇮🇹 · Veronica Riquer🇮🇹
Abstract
Tetraquarks QQq*q* are found to be described remarkably well with the Quantum Chromodynamics version of the Hydrogen bond, as treated with the Born-Oppenheimer approximation. We show the robustness of the method by computing the mass of the observed Tcc tetraquark following two different paths. Relying on this, we provide a prediction for the mass of the expected Tbb particle. The average sizes of tetraquarks are estimated to be approximately 3 - 5 GeV**-1. As a consequence hyperfine separations are not expected to be sizeable. We discussed possible reasons why LHCb has observed only one state in the DD* spectrum.
Comments: 8 pages, 1 figure. Corrections made. Improved draft. To appear in PLB