Doubly-Charged T++ Cc States in the Dynamical Diquark Model

Abstract

One of the celebrated tools in explaining the hydrogen atom is Born-Oppenheimer approximation. The resemblance of QQq<overline> <overline> q <overline> tetraquarks to hydrogen atom within quantum chromodynamics implies usage of Born-Oppenheimer approximation for these multiquark states. In this work, we use dynamical diquark model to calculate mass spectra and sizes of doubly charmed and charged tetraquark states denoted as T ++ cc . Our results for mass spectra indicate some bound-state candidates with respect to corresponding two- meson thresholds. Calculation of expectation values of tetraquark states are compact. p ffiffiffiffiffiffi ( r 2 ) reflects that doubly charmed and charged