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One of the celebrated tools in explaining the Hydrogen atom isBorn-Oppenheimer approximation. The resemblance of $QQ\bar{q}\bar{q}$tetraquarks to Hydrogen atom within Quantum chromodynamics (QCD) implies usageof Born-Oppenheimer approximation for these multiquark states. In this work, weuse dynamical diquark model to calculate mass spectra and sizes of doublycharmed and charged tetraquark states denoted as $T_{cc}^{++}$. Our results formass spectra indicate some bound state candidates with respect to correspondingtwo-meson thresholds. Calculation of expectation values of $\sqrt{\langle r^2\rangle}$ reflects that doubly charmed and charged tetraquark states arecompact.

Doubly-Charged $T_{cc}^{++}$ States in the Dynamical Diquark Model