Mass spectra of doubly heavy mesons in Regge phenomenology

In Regge phenomenology, we first study the spectra of charmonium and bottomonium in the (n,M²) plane and predict masses of some charmonium and bottomonium states which have not been observed now. Then, with the aid of the additivity of intercepts and inverse slopes, we calculate the masses of ground S-wave and P-wave cb̄ meson states and their first radial excited states. The predictions are in reasonable agreement with the existing experimental data and those suggested in many other approaches. The predictions may be useful for the discovery of the unobserved cc̄, bb̄, and cb̄ mesons and the JP assignment of these states.