Mass Spectra of Ξ bc within a Relativistic Flux Tube Framework

In this work, we analyze the mass spectrum of the doubly heavy baryons Ξ bc using a relativistic flux tube approach that incorporates spin interactions. The baryon is modeled through a quark–diquark picture, where a bottom–charm diquark is connected to a light quark by a rotating stringlike flux tube. Spin–dependent terms are included to account for fine structural effects. Our computed ground-state masses of Ξ bc agree well with prior theoretical predictions, demonstrating the robustness of the model. We also provide systematic estimates for a wide range of orbital and radial excitations. These results supply valuable theoretical input for current and upcoming experiments, particularly at the LHC, by offering benchmarks for identifying potential Ξ bc signatures in data. As bottom–charm baryons remain experimentally unobserved, the present study establishes an essential reference for future discoveries in this sector.