Study of the mass spectra of doubly heavy $\hat{I}{ž}_{Q{Q}^{\prime }}$ and $\hat{I}{\text{c◯}}_{Q{Q}^{\prime }}$ baryons

Ji-Hai Pan, Ji-Si Pan

LHCb Collaboration first observed a doubly charmed baryon $\hat{I}{ž}_{cc}^{++}$ in the $\hat{I}{›}_c^{+}{K}^{-}\ddot{I}{€}^{+}\ddot{I}{€}^{+}$ decay with a mass of $3621.40\pm 0.72\pm 0.27$ MeV. In this paper, we en…